Tricholomopsis osiliensis is a rare, recently described species, known from two Estonian islands in the Baltic Sea. In 2009 it was also found in Dobročský prales virgin forest in Slovakia. Macro– and microcharacters of this collection are presented in detail. The Slovak collection has brighter colours, a more distinctly fibrillose pileus surface, larger and more elongated spores, larger basidia, and more abundant pleurocystidia than the holotype collection. However, a DNA study showed that the Estonian and Slovak collections form a well-supported, not very variable clade. In the light of this finding some differences in macro– and microcharacters are better understood. The darker colours and more pronounced fibrils on the pileus and stipe surface can be attributed to the earlier stage of drying up and ageing of the Slovak fruitbodies. The species has a broader range of spore sizes than was thought before. Its preferable habitats are natural mixed forests, where the fruitbodies appear on fallen trunks of conifers (Picea, Abies).
Holec J. (2012): Tricholomopsis osiliensis (Basidiomycota, Agaricales), recently described from Estonia, found in Slovakia. – Czech Mycology 64(1): 93–100.
