Remarks on the spatial distribution of mycorrhiza in the roots of Epipactis papillosa (Orchidaceae)

The article provides a description of the mycorrhiza in the roots of a generative specimen of Epipactis papillosa Franch. et Sav. (Orchidaceae). The percentage of bark cells inhabited by fungi and the intensity of mycorrhizal infection were calculated in all roots formed in 2010, 2011 and 2012 along all their length. Fungi were distributed in the roots irregularly, being concentrated in one or more zones. The possible connection between mycorrhizal development and weather conditions in corresponding years are discussed. Whereas according to the literature data E. papillosa is considered to be weakly mycotrophic species, with an average intensity of mycorrhizal infection of only 15 %, we found much higher average intensity in the studied specimen, up to 54 %. The possibility of secondary colonization of older roots by fungi in studied specimen was not confirmed.