Pub Date : 1900-01-01DOI: 10.15281/jplantres1887.39.459_en58
The stem of Alsopルila acaulis is characterised by the creeping habit, running horizontally through the ground. It has, in a largest one, 20 cm. in length and 3 cm. in diameter, and the leaves are small less than 1.5 m. in length, so that the general form looks like the most of the Phypodiacean species. But, the internal. structure of the rhizome, as well as the leaf, shows the typical Cyatheacean type. The main stele of the rhizome is constructed in a dictyostelic form, each meristele enveloped by the characteristic sclerenchymatous bands, and the medullary strands, less than ten in number in a level, are also accompanied by the same tissue. They are originated in the pith and run through up to a leaf gap, to which they are comュ municated. In the petiole, a few pairs of vascular strands are arranged in an arc, but at least one pair is situated projecting somewhat inwards, showing the characteristic Cyatheacean type. In spite of the dorsiventrality of the rhizome, al of the tissues are constructed in a radial form. So far as the external forms are concerned, this plant is similar to the Polypodiacean species, but its internal structure of the vegetative organs, as well as the sporangial character show the characteristic features of Alsophilan species, so that it will be an interesting instance of Alsophila with a creeping rhizome.
Alsop ila acaulis的茎具有匍匐习性，水平穿过地面。最大的一个有20厘米长。在长度和3厘米。直径大，叶子小，长度不到1.5米，所以一般的形状看起来像大多数的藻底亚纲物种。但是，内部。根茎的结构，以及叶片，显示典型的cyatheacian类型。根状茎的主柱呈双子骨状，每一个分生节被特有的厚壁组织带包围，髓束每层少于10根，也有相同的组织。它们起源于髓，向上延伸至叶隙，并与叶隙相通。在叶柄内，几对维管束呈弧形排列，但至少有一对维管束略向内突出，显示出Cyatheacean型的特征。尽管根状茎是背侧的，但所有的组织都是呈放射状的。就其外部形态而言，该植物与水螅类植物相似，但其营养器官的内部结构以及孢子囊特征显示出了alsophian物种的特征，因此它将是一个具有爬行根茎的Alsophila的有趣实例。
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