Pub Date : 2022-10-13DOI: 10.5252/cryptogamie-algologie2022v43a11
E. Kezlya, A. Glushchenko, J. Kociolek, Y. Maltsev, S. Genkal, M. Kulikovskiy
ABSTRACT A new diatom species of the genus Placoneis Mereschkowsky is described on the basis of molecular and morphological data. The new species, Placoneis asymmetricus Glushchenko, Kezlya, Kulikovskiy & Kociolek, sp. nov., is morphologically characterized by slightly asymmetrical valves along the apical axis based on light and scanning electron microscopy of the exterior and interior of valves. Molecular data, which are derived from live cells, are used for phylogenetic reconstruction based on 18S V4 rDNA and rbcL gene markers of taxa from the genus Placoneis and other diatoms in the order Cymbellales D.G.Mann. Comparisons with other morphologically and molecularly closely-related species are given. RÉSUMÉ Une espèce nouvelle de Placoneis Mereschkowsky (Bacillariophyceae: Cymbellales) des sols humides du sud du Vietnam. Une espèce nouvelle de diatomée du genre Placoneis Mereschkowsky est décrite sur la base de données moléculaires et morphologiques. La nouvelle espèce, Placoneis asymmetricus Glushchenko, Kezlya, Kulikovskiy & Kociolek, sp. nov., se caractérise morphologiquement par des valves légèrement asymétriques le long de l'axe apical selon nos observations au microscope optique et électronique à balayage de l'extérieur et de l'intérieur des valves. Les données moléculaires, extraites de cellules vivantes, sont utilisées pour la reconstruction phylogénétique basée sur l'ADNr 18S V4 et les marqueurs génétiques rbcL des taxons du genre Placoneis et d'autres diatomées de l'ordre des Cymbellales D.G.Mann. Des comparaisons avec d'autres espèces morphologiquement et moléculairement proches sont données.
摘要根据分子和形态资料描述了Placoneis Mereschkowsky硅藻属的一新种。该新种为Placoneis asymmetricus Glushchenko, Kezlya, Kulikovskiy & Kociolek, sp. nov.，根据光镜和扫描电子显微镜对瓣膜内外的观察，其形态学特征是沿顶轴有略微不对称的瓣膜。分子数据来源于活细胞，基于18S V4 rDNA和rbcL基因标记对Cymbellales d.g.m n目Placoneis属和其他硅藻分类群进行系统发育重建。与其他形态和分子上密切相关的物种进行了比较。RÉSUMÉ越南南部湿性土壤的新发现(硅藻科:青藻科)。一种新的硅藻模数，即单硅藻模数和形态模数。La中篇小说一种Placoneis asymmetricus Glushchenko、Kezlya Kulikovskiy & Kociolek sp. 11月,se caracterise morphologiquement par des阀门legerement asymetriques le长de l 'axe顶端根据nos盟显微镜观察optique et electronique扫除de外面et de l 'interieur des阀门。那些不喜欢的人，那些不喜欢的人，那些不喜欢的人，那些不喜欢的人，那些喜欢的人，那些喜欢的人，那些喜欢的人，那些喜欢的人，那些喜欢的人，那些喜欢的人。本文比较了三种不同类型的遗传变异和不同的遗传变异。
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Pub Date : 2022-10-04DOI: 10.5252/cryptogamie-algologie2022v43a10
I. Jüttner, P. Hamilton, C. E. Wetzel, Bart Van de Vijver, L. King, M. Kelly, David M. Williams, L. Ector
ABSTRACT Six species of the genus Achnanthidium Kütz. with straight terminal raphe fissures including Achnanthidium caledonicum (Lange-Bert.) Lange-Bert., A. sieminskae Witkowski, Kulikowskiy & Riaux-Gob., Achnanthidium neomicrocephalum Lange-Bert. & F.Staab and Achnanthidium minutissimum (Kütz.) Czarn. were studied using light and scanning electron microscopy, and shape analysis. The type of Achnanthes microcephala f. scotica J.R.Carter (synonym: A. caledonica) and a population of A. neomicrocephalum from its type locality were investigated. Two new species, Achnanthidium tirolense sp. nov. and Achnanthidium lacuslustense sp. nov., found in two oligotrophic lakes in Germany and Austria, were described. Achnanthidium tirolense sp. nov. is distinguished by its rhombic-lanceolate valves with a slightly inflated valve centre and an acute-angled fascia on the raphe valve, and Achnanthidium lacuslustense sp. nov. by its large capitate poles, broad fascia on the raphe valve and strongly curved frustules. The distribution of A. caledonicum, A. sieminskae, A. neomicrocephalum and A. minutissimum in relation to land use and their species associations were investigated in 52 rivers, streams, and lakes of Scotland. Achnanthidium sieminskae, A. caledonicum, and A. neomicrocephalum were found in areas with low human impact where seminatural vegetation was dominant. The latter two species are typical in mountainous areas. In contrast, A. minutissimum sensu stricto was found in locations where human impact was greater. Although further data are required to determine which environmental variables underlie these distributions, our results suggest that the treatment of these species should be revised in ecological status assessments, and taxa aggregated under A. minutissimum sensu lato should be distinguished in ecological and biogeographical studies. RÉSUMÉ Étude de la morphologie et de la distribution de quatre espèces d'Achnanthidium Kütz. (Bacillariophyta), implications pour l'évaluation de l'état écologique, et description de deux espèces nouvelles européennes. Six espèces du genre Achnanthidium Kütz. à fissure terminale droite du raphé incluant Achnanthidium caledonicum (Lange-Bert.) Lange-Bert., A. sieminskae Witkowski, Kulikovskiy & Riaux-Gob., A. neomicrocephalum Lange-Bert. & F.Staab et A. minutissimum (Kütz.) Czarn. ont été étudiées en utilisant microscopie optique, microscopie électronique à balayage et analyse de forme. Le type d'Achnanthes microcephala f. scotica J.R.Carter (synonyme: A. caledonica) et une population d'A. neomicrocephalum provenant de sa localité type ont été étudiés. Deux espèces nouvelles, Achnanthidium tirolense sp. nov. et A. lacuslustense sp. nov., observées dans deux lacs oligotrophes en Allemagne et Autriche, ont été décrites. Achnanthidium tirolense sp. nov. se distingue des autres espèces du genre par ses valves rhombiques-lancéolées avec un centre valvaire légèrement gonflé et un fascia à angle aigu sur la valve du raphé, e
摘要/ ABSTRACT摘要:本文分Achnanthidium k tz属6种。具有直的末端裂缝，包括Achnanthidium caledonicum (Lange-Bert.)Lange-Bert。， A. sieminskae Witkowski, Kulikowskiy & Riaux-Gob。，新小头棘球蚴。& F.Staab and Achnanthidium minutissimum (k z.)Czarn。用光镜和扫描电镜对其进行了研究，并进行了形状分析。对小头棘球蚴(Achnanthes microcephalala f. scotica J.R.Carter，同名:a . caledonica)和新小头棘球蚴(a . neomicofcephalum)在其类型地的种群进行了调查。报道了在德国和奥地利两个贫营养湖泊中发现的两个新种:Achnanthidium tirolense sp. 11和Achnanthidium lacuslustense sp. 11。其特征是其菱形披针形瓣，瓣中心略膨大，中缝瓣上有锐角的筋膜;其特征是其大的头状极，中缝瓣上有宽的筋膜和强烈弯曲的果壳。本文调查了苏格兰52条河流、溪流和湖泊中caledonicum、sieminskae、neommicroshophalum和minutissimum的分布与土地利用的关系及其物种关联。在人类活动影响较小、半自然植被为主的地区，发现了绢草、绢草和新小头草。后两种在山区是典型的。相反，在人类活动影响较大的地区，发现了最小感草。虽然需要进一步的数据来确定这些分布背后的环境变量，但我们的研究结果表明，在生态状况评估中应修订这些物种的处理方法，并且在生态和生物地理研究中应区分聚集在小黄犀下的分类群。RÉSUMÉ Étude形态学与分布学研究。(硅藻纲)，对“1”的影响，“1”的“1”的“1”的“1”的“1”的“1”的“1”的“1”的“1”的“1”的“1”的“3”的描述。六种蜈蚣草。裂谷终端机裂谷(裂谷终端机裂谷)Lange-Bert。， A. sieminskae Witkowski, Kulikovskiy & Riaux-Gob。， A.新小头脑。& F.Staab等A. minutissimum (k兹。)Czarn。光学显微镜，电子显微镜，电子显微镜，混合和分析。小头蛇(a.s caledonica)等1个种群。新小头症的来源是一种地方性的型的型的。新个体，11月和11月A. lacuslustense, 11月，观察到在Allemagne和Autriche中有两个低营养个体的个体，而不是单纯的个体。Achnanthidium tirolense公司11月11日发布的文件显示，不同的数据显示，不同的数据显示，不同的数据显示，不同的数据显示，不同的数据显示，不同的数据显示，不同的数据显示，不同的数据显示，不同的数据显示，不同的数据显示，不同的数据显示，不同的数据显示，不同的数据显示，不同的数据显示，不同的数据显示，不同的数据显示，不同的数据显示，不同的数据显示，不同的数据显示，不同的数据显示，不同的数据显示，不同的数据显示，不同的数据显示，不同的数据显示，不同的数据显示，不同的数据显示，不同的数据显示，不同的数据显示，不同的数据显示，不同的数据显示，不同的数据显示，不同的数据显示，不同的数据显示，不同的数据显示，不同的数据显示，不同的数据显示。A.分布，A. caledonium, A. sieminskae, A. neomicmicrocephalum和A. minutissimum的关系，以及对土地和技术协会的利用，以及与的的的的的的的的的组织。单胞胞、单胞胞、单胞胞、单胞胞、单胞胞、单胞胞、单胞胞、单胞胞、单胞胞、单胞胞、单胞胞、单胞胞、单胞胞、单胞胞、单胞胞、单胞胞。两种不同的生活方式和生活方式都有不同的特点。在报复方面，a .最低限度的意义上严格地认为，在对人类的影响上，最重要的是，在对人类的影响上，最重要的是，在对人类的影响上。不确定的交换交换交换交换交换交换交换交换交换交换交换交换交换交换交换交换交换交换交换交换交换交换交换交换交换交换交换交换交换交换交换交换交换交换交换交换交换交换交换交换交换交换交换交换交换交换交换交换交换交换交换交换交换交换交换交换交换交换交换交换交换交换交换。最小感知延迟变异être ssamparacimans, les sametans, sametacologiques和biogmograpques。
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Pub Date : 2022-07-15DOI: 10.5252/cryptogamie-algologie2022v43a9
I. Garrido‐Benavent, S. Chiva, C. Bordenave, A. Molins, E. Barreno
ABSTRACT Coccoid microalgae of the genus Trebouxia Puymaly are by far the most prevalent among the various species involved in lichen symbioses. However, their taxonomic knowledge is rather scarce compared to that of lichenized fungi. In the present work, a taxonomic study integrating diverse techniques (phylogenetics, light, confocal and transmission electron microscopies) is carried out to describe Trebouxia maresiae Garrido-Benavent, Chiva & Barreno, sp. nov. This species widely associates with the red-listed lichenized fungus Seirophora villosa (Ach.) Frödén but also with species of the genus Ramalina Ach., both occurring in coastal environments in the western Mediterranean and the Cape Verdean islands. This microalga is circumscribed to Trebouxia clade A and is closely related to T. decolorans Ahmadjian. It is characterized by the cell size being up to 15 µm in diam., the crenulate chloroplasts, and the structure of pyrenoids, which in cultured cells fits well with the crenulata-type, with long branched tubules meandering through the pyrenoid matrix, whereas in the lichenized state it acquires a hybrid structure (maresiae-type), characterized by the periphery of the pyrenoid being rather gigantea-type, with thylakoid membranes forming short, branched tubules. With the present work, the taxonomy of the genus Trebouxia moves a step forward towards more accurately characterizing species in lichen microalgae which is a prerequisite for future, more complex studies on speciation, co-evolution and selectivity. RÉSUMÉ Trebouxia maresiae sp. nov. (Trebouxiophyceae, Chlorophyta), une espèce nouvelle de microalgue lichénisée présente dans les environnements côtiers. Les microalgues cocoïdes du genre Trebouxia Puymaly sont les plus répandues parmi les différentes espèces associées aux symbioses lichéniques. Cependant, la connaissance taxonomique de ces espèces est plutôt lacunaire par rapport à celle des champignons lichénisés. Dans ce travail, une étude taxonomique intégrant diverses techniques (phylogénétique, microscopies optique, confocale et électronique à transmission) a été réalisée pour décrire Trebouxia maresiae Garrido-Benavent, Chiva & Barreno, sp. nov. Cette espèce s'associe principalement au champignon lichénisé Seirophora villosa (Ach.) Frödén, figurant sur la liste rouge, mais aussi avec des espèces du genre Ramalina Ach., tous deux présents dans les environnements côtiers de la Méditerranée occidentale et des îles du Cap-Vert. Cette microalgue est circonscrite au clade A de Trebouxia, et démontre une relation étroite avec T. decolorans Ahmadjian. Elle se caractérise par la taille de ses cellules (jusqu'à 15 µm de diamètre), ses chloroplastes crénelés et la structure de ses pyrénoïdes qui, dans les cellules cultivées, correspond bien au crenulata-type, avec de longs tubules ramifiés serpentant dans la matrice du pyrénoïde, alors qu'à l'état lichénisé, elle adopte une structure hybride (maresiae-type), caractérisée par la périphérie du py
球藻属微藻(Trebouxia Puymaly)是迄今为止在地衣共生的各种物种中最普遍的。然而，与地衣真菌的分类知识相比，它们的分类知识相当匮乏。本文采用系统发育、光学、共聚焦和透射电子显微镜等多种技术对Trebouxia marsiae Garrido-Benavent, Chiva & Barreno, sp. 11 .进行了分类研究。该物种与红色苔藓真菌Seirophora villosa (Ach.)有广泛的联系。Frödén但也与Ramalina Ach属的物种有关。这两种疾病都发生在地中海西部和佛得角群岛的沿海环境中。该微藻归属于微藻A支系，与T. decolorans Ahmadjian有密切关系。其特点是细胞直径可达15µm，具有圆齿状叶绿体和类pyrenox的结构，在培养的细胞中，类pyrenox的结构与类crenula型非常吻合，有长分支的小管蜿蜒穿过类pyrenox基质，而在地衣化状态下，它获得一种杂交结构(maresiae型)，其特征是类pyrenox的外围相当巨大，类囊体膜形成短分支的小管。通过本文的工作，Trebouxia属的分类向着更准确地表征地衣微藻的物种迈出了一步，这为未来更复杂的物种形成、协同进化和选择性研究奠定了基础。RÉSUMÉ海藻类sp. 11 .(海藻类科，绿藻门)，1 espece nouvelle de微藻lichsamissame pracimente dans les环境côtiers。Les microalgues cocoïdes du genre Trebouxia Puymaly将Les plus和consames和parmi、diffsames和espires、associes和symbioses、lichsamniques组成。参考文献:关于电子电子信息分类的文献:plutôt关于电子电子信息分类的文献:关于电子电子信息分类的文献。在不同的技术(系统的、光学的、光学显微镜的、共焦的和电子传输的)的基础上，在不同的技术(系统的、光学的、共焦的和电子传输的)的基础上，在不同的技术(系统的、光学的、光学的和电子传输的)的基础上，在不同的技术(系统的、光学的)的基础上，在不同的技术(系统的、光学的)的基础上，在不同的技术(系统的)的基础上，在不同的技术(系统的)上。Frödén，象征的sur la liste rouge, mais aussi avec des esp du流派Ramalina Ach。(a)我们的双份薪金薪金和其他薪金薪金côtiers我们的双份薪金薪金和西方薪金薪金与我们的双份薪金薪金薪金。Cette microalgue est conconite au clade A de Trebouxia, and Cette microalgue est conconite at A . Trebouxia，和Cette microalgue的关系。Elle se caracterise par身材de ses小房(一直到萨那15µm de直径),ses叶绿体枪眼et de la结构ses蛋白核,在小房cultivees,对应好盟crenulata-type,用德多头小管都serpentant在矩阵du pyrenoide,那么当我即lichenise, Elle adopte一个结构hybride (maresiae-type) caracterisee par la peripherie du pyrenoide etant成du gigantea-type,Avec les membrane des thylacoïdes, formant des tubes, courts et ramfisides。同样的贡献，如:《关于类型分类的贡献》，《关于准许自由的先进者的报告》，《关于准许自由的先进者的报告》，《关于准许自由的报告》，《关于准许自由的报告》，《关于准许自由的报告》，《关于准许自由的报告》，《关于准许自由的报告》，《关于准许自由的报告》，《关于准许自由的报告》，《关于准许自由的报告》，《关于准许自由的报告》，《关于准许自由的报告》。
{"title":"Trebouxia maresiae sp. nov. (Trebouxiophyceae, Chlorophyta), a New Lichenized Species of Microalga Found in Coastal Environments","authors":"I. Garrido‐Benavent, S. Chiva, C. Bordenave, A. Molins, E. Barreno","doi":"10.5252/cryptogamie-algologie2022v43a9","DOIUrl":"https://doi.org/10.5252/cryptogamie-algologie2022v43a9","url":null,"abstract":"ABSTRACT Coccoid microalgae of the genus Trebouxia Puymaly are by far the most prevalent among the various species involved in lichen symbioses. However, their taxonomic knowledge is rather scarce compared to that of lichenized fungi. In the present work, a taxonomic study integrating diverse techniques (phylogenetics, light, confocal and transmission electron microscopies) is carried out to describe Trebouxia maresiae Garrido-Benavent, Chiva & Barreno, sp. nov. This species widely associates with the red-listed lichenized fungus Seirophora villosa (Ach.) Frödén but also with species of the genus Ramalina Ach., both occurring in coastal environments in the western Mediterranean and the Cape Verdean islands. This microalga is circumscribed to Trebouxia clade A and is closely related to T. decolorans Ahmadjian. It is characterized by the cell size being up to 15 µm in diam., the crenulate chloroplasts, and the structure of pyrenoids, which in cultured cells fits well with the crenulata-type, with long branched tubules meandering through the pyrenoid matrix, whereas in the lichenized state it acquires a hybrid structure (maresiae-type), characterized by the periphery of the pyrenoid being rather gigantea-type, with thylakoid membranes forming short, branched tubules. With the present work, the taxonomy of the genus Trebouxia moves a step forward towards more accurately characterizing species in lichen microalgae which is a prerequisite for future, more complex studies on speciation, co-evolution and selectivity. RÉSUMÉ Trebouxia maresiae sp. nov. (Trebouxiophyceae, Chlorophyta), une espèce nouvelle de microalgue lichénisée présente dans les environnements côtiers. Les microalgues cocoïdes du genre Trebouxia Puymaly sont les plus répandues parmi les différentes espèces associées aux symbioses lichéniques. Cependant, la connaissance taxonomique de ces espèces est plutôt lacunaire par rapport à celle des champignons lichénisés. Dans ce travail, une étude taxonomique intégrant diverses techniques (phylogénétique, microscopies optique, confocale et électronique à transmission) a été réalisée pour décrire Trebouxia maresiae Garrido-Benavent, Chiva & Barreno, sp. nov. Cette espèce s'associe principalement au champignon lichénisé Seirophora villosa (Ach.) Frödén, figurant sur la liste rouge, mais aussi avec des espèces du genre Ramalina Ach., tous deux présents dans les environnements côtiers de la Méditerranée occidentale et des îles du Cap-Vert. Cette microalgue est circonscrite au clade A de Trebouxia, et démontre une relation étroite avec T. decolorans Ahmadjian. Elle se caractérise par la taille de ses cellules (jusqu'à 15 µm de diamètre), ses chloroplastes crénelés et la structure de ses pyrénoïdes qui, dans les cellules cultivées, correspond bien au crenulata-type, avec de longs tubules ramifiés serpentant dans la matrice du pyrénoïde, alors qu'à l'état lichénisé, elle adopte une structure hybride (maresiae-type), caractérisée par la périphérie du py","PeriodicalId":51000,"journal":{"name":"Cryptogamie Algologie","volume":"18 1","pages":"135 - 145"},"PeriodicalIF":1.3,"publicationDate":"2022-07-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73056002","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-06-23DOI: 10.5252/cryptogamie-algologie2022v43a8
V. Malavasi, M. Klimešová, A. Lukešová, P. Škaloud
ABSTRACT The present paper provides a phylogenetic and morphological study of two strains that turn out to represent a new genus and species, Rindifilum ramosum gen. nov., sp. nov., within the family Ctenocladiaceae (Ulvales). Rindifilum ramosum gen. nov., sp. nov. grows in association with the lichenized ascomycetes genus Verrucaria Schrader. Phylogenetic reconstructions based on the rbcL, 18S rRNA and tufA genes showed that the investigated strains belonged to a lineage distinct from those sequenced so far. Moreover, comparisons based on morphological observations revealed no differences between the two strains. The newly genus Rindifilum gen. nov. exhibits a unique combination of morphological features, as the “pear-shaped” cells that develop directly into a “hammer-shaped filament”, making it distinct from all other green algae described so far. RÉSUMÉ Rindifilum ramosum gen. nov., sp. nov., un nouveau genre d'eau douce au sein des Ulvales (Ulvophyceae, Chlorophyta). Le présent article fournit une étude phylogénétique et morphologique de deux souches qui s'avèrent représenter un genre nouveau et une espèce nouvelle, Rindifilum ramosum gen. nov., sp. nov., au sein de la famille des Ctenocladiaceae (Ulvales). Rindifilum ramosum gen. nov., sp. nov. se développe en association avec le genre Verrucaria Schrader, un ascomycète lichénisé. Les reconstructions phylogénétiques basées sur les gènes rbcL, 18S rRNA et tufA ont montré que les souches étudiées appartiennent à une lignée distincte de celles séquencées jusqu'à présent. De plus, les comparaisons basées sur les observations morphologiques n'ont révélé aucune différence entre les deux souches. Le nouveau genre Rindifilum gen. nov. présente une combinaison unique de caractéristiques morphologiques, comme les cellules en forme de « poire » qui se développent directement en un « filament en forme de marteau », ce qui le distingue de toutes les autres algues vertes décrites jusqu'à présent.
摘要本文对Ctenocladiaceae (Ulvales)中两个新属新种Rindifilum ramosum gen. nov.， sp. nov.进行了系统发育和形态学研究。Rindifilum ramosum gen. nov.， sp. nov.与地衣子囊菌Verrucaria Schrader一起生长。基于rbcL、18S rRNA和tufA基因的系统发育重建表明，所研究的菌株属于与迄今为止测序的菌株不同的谱系。此外，基于形态学观察的比较显示两个菌株之间没有差异。新属Rindifilum gen. 11 .表现出独特的形态特征组合，如“梨形”细胞直接发育成“锤形细丝”，使其与迄今为止描述的所有其他绿藻不同。RÉSUMÉ紫叶藻gen. nov.， sp. nov.， un nouveau genre d'eau douce au sein des Ulvales(紫叶藻科，绿藻)。[4][1][4][1][1][1][1][1][1][1][1][1][1][1][1][1][1][1][1][1][1][4][1][1][1][1][1][1][1][1][1][1][1][1][1][1][1][1][1][1][1][1][1][1][1][1]。[3] [1] [1] [1] [1] [3] [1] [3] [1] [3] [1] [3] [3] [3] [3] [1] [3] [1] [4] [1] [4] [1] [4] [1] [4]Les重建phylogenetiques基地苏尔Les基因:18 s rRNA et凝灰岩安大略省的装饰音管,Les souches学习同时属于一个lignee distincte de细胞序列一直到现在。另外，比较比较是指观察，形态上的差异是指两种差异。新体裁Rindifilum gen11 . pracentente une组合unique de caracentsamristiques morphologiques, comme les cells en forme de poire, qume se dacentente发展方向en en forme de marteau, ce qui Le unique de toutes les les les les algues vertes dacrites just qu' comacentente。
{"title":"Rindifilum ramosum gen. nov., sp. nov., a New Freshwater Genus within the Ulvales (Ulvophyceae, Chlorophyta)","authors":"V. Malavasi, M. Klimešová, A. Lukešová, P. Škaloud","doi":"10.5252/cryptogamie-algologie2022v43a8","DOIUrl":"https://doi.org/10.5252/cryptogamie-algologie2022v43a8","url":null,"abstract":"ABSTRACT The present paper provides a phylogenetic and morphological study of two strains that turn out to represent a new genus and species, Rindifilum ramosum gen. nov., sp. nov., within the family Ctenocladiaceae (Ulvales). Rindifilum ramosum gen. nov., sp. nov. grows in association with the lichenized ascomycetes genus Verrucaria Schrader. Phylogenetic reconstructions based on the rbcL, 18S rRNA and tufA genes showed that the investigated strains belonged to a lineage distinct from those sequenced so far. Moreover, comparisons based on morphological observations revealed no differences between the two strains. The newly genus Rindifilum gen. nov. exhibits a unique combination of morphological features, as the “pear-shaped” cells that develop directly into a “hammer-shaped filament”, making it distinct from all other green algae described so far. RÉSUMÉ Rindifilum ramosum gen. nov., sp. nov., un nouveau genre d'eau douce au sein des Ulvales (Ulvophyceae, Chlorophyta). Le présent article fournit une étude phylogénétique et morphologique de deux souches qui s'avèrent représenter un genre nouveau et une espèce nouvelle, Rindifilum ramosum gen. nov., sp. nov., au sein de la famille des Ctenocladiaceae (Ulvales). Rindifilum ramosum gen. nov., sp. nov. se développe en association avec le genre Verrucaria Schrader, un ascomycète lichénisé. Les reconstructions phylogénétiques basées sur les gènes rbcL, 18S rRNA et tufA ont montré que les souches étudiées appartiennent à une lignée distincte de celles séquencées jusqu'à présent. De plus, les comparaisons basées sur les observations morphologiques n'ont révélé aucune différence entre les deux souches. Le nouveau genre Rindifilum gen. nov. présente une combinaison unique de caractéristiques morphologiques, comme les cellules en forme de « poire » qui se développent directement en un « filament en forme de marteau », ce qui le distingue de toutes les autres algues vertes décrites jusqu'à présent.","PeriodicalId":51000,"journal":{"name":"Cryptogamie Algologie","volume":"37 1","pages":"125 - 133"},"PeriodicalIF":1.3,"publicationDate":"2022-06-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85428551","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-06-16DOI: 10.5252/cryptogamie-algologie2022v43a7
Jeffery R. Hughey, P. Gabrielson
ABSTRACT Ulva nematoidea Bory is a currently accepted species distributed in the south eastern Pacific Ocean from Mexico to Chile. Its identity however remains unknown because no DNA sequences have been obtained from the type specimen. To determine its identity and taxonomic status, we performed high-throughput sequencing on a fragment of the lectotype specimen of U. nematoidea. Genetic analyses of the rbcL, tufA and nuclear ITS DNA found that U. nematoidea is identical in sequence to U. lactuca L. These results indicate that U. nematoidea is a synonym of U. lactuca and further highlight the need for sequencing additional type specimens of Ulva L. RÉSUMÉ L'analyse de l'ADN du spécimen lectotype d'Ulva nematoidea Bory (Ulvaceae, Chlorophyta) détermine sa synonymie avec Ulva lactuca L. Ulva nematoidea Bory est une espèce actuellement acceptée répartie dans le sud-est de l'océan Pacifique, du Mexique au Chili. Son identité reste cependant inconnue car aucune séquence d'ADN n'a été obtenue à partir du spécimen type. Pour déterminer son identité et son statut taxonomique, nous avons effectué un séquençage à haut débit sur un fragment du spécimen lectotype d'U. nematoidea. Les analyses génétiques de l'ADN rbcL, tufA et ITS nucléaire ont révélé que U. nematoidea a une séquence identique à U. lactuca L. Ces résultats indiquent que U. nematoidea est un synonyme de U. lactuca et soulignent davantage la nécessité de séquencer des spécimens types supplémentaires d'Ulva L.
Bory乌尔瓦线虫(Ulva nematoidea Bory)是目前公认的一种，分布在墨西哥至智利的东南太平洋。然而，它的身份仍然未知，因为没有从模式标本中获得DNA序列。为了确定其身份和分类学地位，我们对美国线虫标本的一个片段进行了高通量测序。rbcL、tufA和核ITS DNA的遗传分析发现，U. nematoidea与U. lactuca .序列相同。这些结果表明U. nematoidea是U. lactuca .的同义词，并进一步强调了对U. Ulva .的其他类型标本进行测序的必要性RÉSUMÉ L'analyse de L 'ADN du spsamcimen lectotype d'Ulva nematoidea Bory (Ulvaceae，绿藻(Ulva。儿子确定了不依赖于其他类型的个体，如:aucune ssamquence d'ADN n'a ssamicimen型个体。在美国，所有的人都知道，在美国，所有的人都知道，在美国，所有的人都知道，在美国，所有的人都知道，在美国，所有的人都知道，在美国，所有的人都知道。线虫类。Les分析genetiques de l 'ADN rbcL,凝灰岩等其远离游客revele,美国线虫类有一个序列identique美国以l .这些结果,线虫类indiquent是联合国synonyme de美国以et soulignent davantage la活动de音序器des标本类型supplementaires d 'Ulva l。
{"title":"DNA Analysis of the Lectotype Specimen of Ulva nematoidea Bory (Ulvaceae, Chlorophyta) Determines Its Synonymy with Ulva lactuca L.","authors":"Jeffery R. Hughey, P. Gabrielson","doi":"10.5252/cryptogamie-algologie2022v43a7","DOIUrl":"https://doi.org/10.5252/cryptogamie-algologie2022v43a7","url":null,"abstract":"ABSTRACT Ulva nematoidea Bory is a currently accepted species distributed in the south eastern Pacific Ocean from Mexico to Chile. Its identity however remains unknown because no DNA sequences have been obtained from the type specimen. To determine its identity and taxonomic status, we performed high-throughput sequencing on a fragment of the lectotype specimen of U. nematoidea. Genetic analyses of the rbcL, tufA and nuclear ITS DNA found that U. nematoidea is identical in sequence to U. lactuca L. These results indicate that U. nematoidea is a synonym of U. lactuca and further highlight the need for sequencing additional type specimens of Ulva L. RÉSUMÉ L'analyse de l'ADN du spécimen lectotype d'Ulva nematoidea Bory (Ulvaceae, Chlorophyta) détermine sa synonymie avec Ulva lactuca L. Ulva nematoidea Bory est une espèce actuellement acceptée répartie dans le sud-est de l'océan Pacifique, du Mexique au Chili. Son identité reste cependant inconnue car aucune séquence d'ADN n'a été obtenue à partir du spécimen type. Pour déterminer son identité et son statut taxonomique, nous avons effectué un séquençage à haut débit sur un fragment du spécimen lectotype d'U. nematoidea. Les analyses génétiques de l'ADN rbcL, tufA et ITS nucléaire ont révélé que U. nematoidea a une séquence identique à U. lactuca L. Ces résultats indiquent que U. nematoidea est un synonyme de U. lactuca et soulignent davantage la nécessité de séquencer des spécimens types supplémentaires d'Ulva L.","PeriodicalId":51000,"journal":{"name":"Cryptogamie Algologie","volume":"112 1","pages":"117 - 124"},"PeriodicalIF":1.3,"publicationDate":"2022-06-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79209600","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-05-25DOI: 10.5252/cryptogamie-algologie2022v43a6
E. Ballesteros, N. Sant
ABSTRACT Photosynthetic features of different canopy-forming macroalgae of the order Fucales (Phaeophyceae) living in shallow and sheltered environments show a high homogeneity when compared with other morphologically similar species living across a depth gradient. Photosynthesis at saturation (situated around 5 mg O2 gAFDM 1 h1) and photosynthetic efficiency [around 0.4 mg O2·m2 s (µmol photon·gAFDM·h)-1] are relatively low, while dark respiration (around 1 mg O2 gAFDM 1 h1) and light at compensation (around 24 µmol photon·m-2·s-1) are relatively high, as it corresponds to the characteristics of “sun” plants. C:N and C:P ratios suggest a strong nutrient limitation for growth and photosynthesis, in agreement with the low dissolved nutrient levels usually found in shallow Mediterranean waters. Homogeneity in photosynthetic features points to a good local adaptation of the different species to the prevailing light conditions but opens the question of which are the factors allowing the coexistence of different species of Fucales in sheltered and shallow Mediterranean environments.
{"title":"Homogeneity of Photosynthetic Features in Canopy-Forming Macroalgae of The Order Fucales from Shallow and Sheltered Environments","authors":"E. Ballesteros, N. Sant","doi":"10.5252/cryptogamie-algologie2022v43a6","DOIUrl":"https://doi.org/10.5252/cryptogamie-algologie2022v43a6","url":null,"abstract":"ABSTRACT Photosynthetic features of different canopy-forming macroalgae of the order Fucales (Phaeophyceae) living in shallow and sheltered environments show a high homogeneity when compared with other morphologically similar species living across a depth gradient. Photosynthesis at saturation (situated around 5 mg O2 gAFDM 1 h1) and photosynthetic efficiency [around 0.4 mg O2·m2 s (µmol photon·gAFDM·h)-1] are relatively low, while dark respiration (around 1 mg O2 gAFDM 1 h1) and light at compensation (around 24 µmol photon·m-2·s-1) are relatively high, as it corresponds to the characteristics of “sun” plants. C:N and C:P ratios suggest a strong nutrient limitation for growth and photosynthesis, in agreement with the low dissolved nutrient levels usually found in shallow Mediterranean waters. Homogeneity in photosynthetic features points to a good local adaptation of the different species to the prevailing light conditions but opens the question of which are the factors allowing the coexistence of different species of Fucales in sheltered and shallow Mediterranean environments.","PeriodicalId":51000,"journal":{"name":"Cryptogamie Algologie","volume":"8 1","pages":"107 - 115"},"PeriodicalIF":1.3,"publicationDate":"2022-05-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85681405","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-05-19DOI: 10.5252/cryptogamie-algologie2022v43a5
K. Wołowski, W. Spisak, A. Chlebicki, Mateusz Szar, J. Kozak, L. Śliwa
ABSTRACT We tested a new two-phase culture medium for culturing microorganisms, in particular algae and fungi. In media composed of mixed gel and solid phases of granite, basalt, sandstone, limestone and sodium glass, we observed the growth of selected species inhabiting the boundaries of the gel medium with the solid phase. The species used were Klebsormidium dissectum (F.Gay) H.Ettl & Gärtner, Vischeria polyphem (Pitschmann) Kryvenda, Rybalka, Wolf & Friedl and Muriella decolor Vischer (algae); and Aspergillus tubingensis R.Mosseray, Aureobasidium pullulans (de Bary) G.Arnaud, Chaetomium globosum Kunze and Penicillium sp. Link (fungi). In the six-weeks period of parallel cultures, the growth rate of the algae inoculum in two-phase media was twice that observed in the control culture (gel medium). The algae also maintained high viability in the new medium.
{"title":"Two-Phase Medium – A New Approach to Microbiological Culturing","authors":"K. Wołowski, W. Spisak, A. Chlebicki, Mateusz Szar, J. Kozak, L. Śliwa","doi":"10.5252/cryptogamie-algologie2022v43a5","DOIUrl":"https://doi.org/10.5252/cryptogamie-algologie2022v43a5","url":null,"abstract":"ABSTRACT We tested a new two-phase culture medium for culturing microorganisms, in particular algae and fungi. In media composed of mixed gel and solid phases of granite, basalt, sandstone, limestone and sodium glass, we observed the growth of selected species inhabiting the boundaries of the gel medium with the solid phase. The species used were Klebsormidium dissectum (F.Gay) H.Ettl & Gärtner, Vischeria polyphem (Pitschmann) Kryvenda, Rybalka, Wolf & Friedl and Muriella decolor Vischer (algae); and Aspergillus tubingensis R.Mosseray, Aureobasidium pullulans (de Bary) G.Arnaud, Chaetomium globosum Kunze and Penicillium sp. Link (fungi). In the six-weeks period of parallel cultures, the growth rate of the algae inoculum in two-phase media was twice that observed in the control culture (gel medium). The algae also maintained high viability in the new medium.","PeriodicalId":51000,"journal":{"name":"Cryptogamie Algologie","volume":"25 1","pages":"95 - 105"},"PeriodicalIF":1.3,"publicationDate":"2022-05-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89971365","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-04-14DOI: 10.5252/cryptogamie-algologie2022v43a4
D. Vidaković, L. Ector, C. E. Wetzel, J. Krizmanić, B. Gavrilović, B. Dojčinović, Miloš Ćirić
ABSTRACT In the present study, a new species, Nitzschia haloserbica Vidaković, Ector, C.E.Wetzel & Krizmanić, sp. nov., is described from alkaline saline ponds and channels from Vojvodina Province (Serbia). In 2019 the new species was found in four saline ponds: Bela Bara, Čoka Kopovo, Velika Rusanda and Slatina. The same species was recorded four years ago in saline lakes in Hungary, but the authors listed it as Nitzschia sp. 2. The sigmoid valve outline of the new Nitzschia Hassall species is similar to N. austriaca Hust. but differs in striae density and fibulae distribution. In N. haloserbica sp. nov. the transapical striae are so dense that they are not visible in light microscopy. Both species have fibulae that are quite regularly distributed along the raphe canal, but in N. austriaca the central two fibulae are more widely spaced, reflecting the presence of central raphe endings, which are absent in N. haloserbica sp. nov. At the type locality (Bela Bara) both species were found with relative abundances of 94.93 % for N. haloserbica sp. nov. and 1.21 % for N. austriaca (of the 400 valves counting per slide). The valve morphology, ultrastructure and autecology of the new species are discussed and compared with morphologically similar taxa.
{"title":"A New Nitzschia Hassall Species (Bacillariaceae, Bacillariophyta) from Saline Ponds in Serbia","authors":"D. Vidaković, L. Ector, C. E. Wetzel, J. Krizmanić, B. Gavrilović, B. Dojčinović, Miloš Ćirić","doi":"10.5252/cryptogamie-algologie2022v43a4","DOIUrl":"https://doi.org/10.5252/cryptogamie-algologie2022v43a4","url":null,"abstract":"ABSTRACT In the present study, a new species, Nitzschia haloserbica Vidaković, Ector, C.E.Wetzel & Krizmanić, sp. nov., is described from alkaline saline ponds and channels from Vojvodina Province (Serbia). In 2019 the new species was found in four saline ponds: Bela Bara, Čoka Kopovo, Velika Rusanda and Slatina. The same species was recorded four years ago in saline lakes in Hungary, but the authors listed it as Nitzschia sp. 2. The sigmoid valve outline of the new Nitzschia Hassall species is similar to N. austriaca Hust. but differs in striae density and fibulae distribution. In N. haloserbica sp. nov. the transapical striae are so dense that they are not visible in light microscopy. Both species have fibulae that are quite regularly distributed along the raphe canal, but in N. austriaca the central two fibulae are more widely spaced, reflecting the presence of central raphe endings, which are absent in N. haloserbica sp. nov. At the type locality (Bela Bara) both species were found with relative abundances of 94.93 % for N. haloserbica sp. nov. and 1.21 % for N. austriaca (of the 400 valves counting per slide). The valve morphology, ultrastructure and autecology of the new species are discussed and compared with morphologically similar taxa.","PeriodicalId":51000,"journal":{"name":"Cryptogamie Algologie","volume":"80 1","pages":"85 - 94"},"PeriodicalIF":1.3,"publicationDate":"2022-04-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87138963","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-03-11DOI: 10.5252/cryptogamie-algologie2022v43a3
S. Hamlaoui, C. Yéprémian, C. Duval, Benjamin Marie, C. Djédiat, B. Piquet, C. Bernard, S. Duperron
ABSTRACT Cyanobacteria and eukaryotic microalgae are key players in life on Earth. They have adapted to a broad diversity of ecosystems, and ensure roughly half of the primary production. Their detailed study greatly benefits from isolated strains, deposited and maintained ex situ in culture collections, and made available to the scientific community along with expert knowledge. Established in the late 1920s, the culture collection of cyanobacteria and microalgae at the French National Museum of Natural History (MNHN) now comprises over 1350 non-axenic live strains isolated mostly from freshwater ecosystems in France. As a research-oriented collection, it contributes to biodiversity, taxonomy, genomics, and bioactive compounds research. Notably, the collection contains multiple strains of various genera of bloom-forming cyanobacteria that are of ecological concern, some of which produce cyanotoxins. Novel strategies for strain identification, conservation and accessibility are being implemented to provide an up-to-date resource to the community. Through research, expertise for ecotoxicology, partnerships with the industry or with artists, the MNHN collection appears at both a repository of biodiversity as well as resource for life sciences.
{"title":"The Culture Collection of Cyanobacteria and Microalgae at the French National Museum of Natural History: A Century Old But Still Alive and Kicking! Including in Memoriam: Professor Alain Couté","authors":"S. Hamlaoui, C. Yéprémian, C. Duval, Benjamin Marie, C. Djédiat, B. Piquet, C. Bernard, S. Duperron","doi":"10.5252/cryptogamie-algologie2022v43a3","DOIUrl":"https://doi.org/10.5252/cryptogamie-algologie2022v43a3","url":null,"abstract":"ABSTRACT Cyanobacteria and eukaryotic microalgae are key players in life on Earth. They have adapted to a broad diversity of ecosystems, and ensure roughly half of the primary production. Their detailed study greatly benefits from isolated strains, deposited and maintained ex situ in culture collections, and made available to the scientific community along with expert knowledge. Established in the late 1920s, the culture collection of cyanobacteria and microalgae at the French National Museum of Natural History (MNHN) now comprises over 1350 non-axenic live strains isolated mostly from freshwater ecosystems in France. As a research-oriented collection, it contributes to biodiversity, taxonomy, genomics, and bioactive compounds research. Notably, the collection contains multiple strains of various genera of bloom-forming cyanobacteria that are of ecological concern, some of which produce cyanotoxins. Novel strategies for strain identification, conservation and accessibility are being implemented to provide an up-to-date resource to the community. Through research, expertise for ecotoxicology, partnerships with the industry or with artists, the MNHN collection appears at both a repository of biodiversity as well as resource for life sciences.","PeriodicalId":51000,"journal":{"name":"Cryptogamie Algologie","volume":"74 1","pages":"41 - 83"},"PeriodicalIF":1.3,"publicationDate":"2022-03-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80794494","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-02-02DOI: 10.5252/cryptogamie-algologie2022v43a2
Adil Y. AL-HANDAL, Maitham A. Al-Shaheen, Rehab N. AL-SAEDY, A. Wulff
ABSTRACT Synedropsis abuflosensis sp. nov. is the third species of the genus recorded from a sub-tropical brackish water habitat as opposed to a polar distribution. This species is differentiated from others in the genus by having a different number of slits in the apical slit field at opposite ends of the valve (i.e., 4 at the end possessing a rimoportula versus 5 at the end lacking a rimoportula), an apically oriented rimoportula and 3-4 non-porous cingular bands. Its habitat is different than that of all known Synedropsis Hasle, Medlin & Syvertsen species as it is either benthic or epiphytic in algal mats rather than planktonic or associated with sea ice. The new species was found in waters with a conductivity of 7.1 µS cm-1 (salinity 3.3 psu) and a temperature of 33 °C. Morphological characters of the new species are described based on light and scanning electron microscopy observations. A comparison of S. abuflosensis sp. nov. with morphologically similar species is provided.
{"title":"Synedropsis abuflosensis sp. nov., a New Araphid Diatom (Bacillariophyceae) from the Shatt Al-Arab River, Southern Iraq","authors":"Adil Y. AL-HANDAL, Maitham A. Al-Shaheen, Rehab N. AL-SAEDY, A. Wulff","doi":"10.5252/cryptogamie-algologie2022v43a2","DOIUrl":"https://doi.org/10.5252/cryptogamie-algologie2022v43a2","url":null,"abstract":"ABSTRACT Synedropsis abuflosensis sp. nov. is the third species of the genus recorded from a sub-tropical brackish water habitat as opposed to a polar distribution. This species is differentiated from others in the genus by having a different number of slits in the apical slit field at opposite ends of the valve (i.e., 4 at the end possessing a rimoportula versus 5 at the end lacking a rimoportula), an apically oriented rimoportula and 3-4 non-porous cingular bands. Its habitat is different than that of all known Synedropsis Hasle, Medlin & Syvertsen species as it is either benthic or epiphytic in algal mats rather than planktonic or associated with sea ice. The new species was found in waters with a conductivity of 7.1 µS cm-1 (salinity 3.3 psu) and a temperature of 33 °C. Morphological characters of the new species are described based on light and scanning electron microscopy observations. A comparison of S. abuflosensis sp. nov. with morphologically similar species is provided.","PeriodicalId":51000,"journal":{"name":"Cryptogamie Algologie","volume":"121 2 1","pages":"31 - 39"},"PeriodicalIF":1.3,"publicationDate":"2022-02-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89401060","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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