Abstract
The seasonal development and mycorrhizal fungi of the mycorrhizae of Platanthera hyperborea, Platanthera obtusata, Platanthera orbiculata, and Coeloglossum viride are described. Fungal endophytes belonging to the following taxa were identified: Leptodontidium orchidicola, Epulorhiza repens, Epulorhiza anaticula comb, nov., and Ceratorhiza goodyerae-repentis. In addition, anamorphic material of a species tentatively identified as Sebacina sp. was found solely in the mycorrhizae of P. orbiculata. A series of isolates bearing distinctive, clamped monilioid cells and belonging to an unidentified species of Sistotrema was found in P. obtusata. This is the first report of a Sistotrema species from orchid mycorrhizae. An isolate from C. viride, with broad hyphae, large globose monilioid cells, and dark brown mycelium, resembles Burgeff's 1936 description of Rhizoctonia anomala nom.inval. This taxon is validated, redescribed, and presented as the new species Moniliopsis anomala.
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