Scaly Pholiota (Sharp-scaly Pholiota) - Pholiota squarrosoides
Theoretically, Pholiota squarrosoides (Strophariaceae) can be separated from the very similar Pholiota squarrosa without the use of a microscope, since its gills go from whitish to rusty brown without passing through a greenish stage, and its cap is often slightly sticky underneath the scales (as opposed to the always-dry cap of Pholiota squarrosa). Additionally, Pholiota squarrosoides never develops the garlicky odor that some collections of Pholiota squarrosa develop.
This is a saprobic and parasitic mushroom; growing in clusters (rarely alone or scattered) on the wood of hardwoods. The species is fairly widely distributed in North America, but very rare in the whole of Europe.
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Photo credit: ©Tatiana Bulyonkova | Locality: Akademgorodok, Novosibirsk, Western Siberia, Russia (2010)