Pluteus romellii

https://www.mushroomexpert.com/Pluteus_romellii.html

Ecology: Saprobic on decaying hardwood logs and debris (especially in beech-maple forests); also found in woodchips in urban areas; growing alone or gregariously; summer and fall; widely distributed in North America. The illustrated and described collections are from Illinois, Kentucky, and Québec.

Cap: 1-4 cm; more or less convex at first, becoming broadly convex or flat, often with a central bump; bald; not slimy or sticky, but with a greasy or almost waxy texture; somewhat wrinkled, especially over the center; dull brown to olive brown (often darker over the center); the margin becoming finely lined.

Gills: Free from the stem or nearly so; close or nearly distant; short-gills frequent; whitish at first, becoming pink as the spores mature.

Stem: 1.5-6 cm long; 1-3 mm thick; equal; fragile; bald, or with tiny fibers; bright yellow to greenish yellow (often brighter toward the base), at least when young; sometimes fading to whitish with a yellowish base; glossary.html#myceliumbasal mycelium white.

Flesh: Insubstantial; pale watery brownish; unchanging when sliced.

Odor and Taste: Not distinctive, or faintly radish-like.

Spore Print: Pink.

Microscopic Features: Spores 5-7 x 5-6 ; broadly ellipsoid to sublacrymoid or subglobose; smooth; hyaline in KOH; inamyloid. Hymenial cystidia 40-55 x 10-15 ; lageniform to subutriform or nearly cylindric; occasionally with a long neck; thin-walled; hyaline in KOH. Pileipellis a cystoderm; brown in KOH; elements subglobose, 20-38 across.

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