Name: Gymnopus dichrous
Author: (Berk. & M.A. Curtis) Halling
Citation: Antonín, V.; Halling, R.E.; Noordeloos, M.E. 1997. Generic concepts within the groups Marasmius and Collybia sensu lato. Mycotaxon. 63:359-368
Preferred Synonyms:Collybiopsis dichroa (Berk. & M.A. Curtis) R.H. Petersen
Deprecated Synonyms: Gymnopus cespitosus, Gymnopus fagineus, Marasmiellus dichrous (Berk. & M.A. Curtis) J.S. Oliveira
Cap: 1-5 (rarely 7) cm; convex with an incurved margin when young, becoming broadly convex, flat, or shallowly depressed; dry; fairly bald; brown to reddish brown or orangish brown at first, fading to pinkish tan or buff; usually becoming somewhat radially wrinkled and developing a broadly lined margin; in old age or in dry conditions often splitting radially and/or becoming contorted.
Gills: Narrowly attached to the stem, or nearly free from it by maturity; close or nearly distant; whitish when young, darkening to pinkish buff; sometimes stained and spotted reddish brown when old.
Stem: 1-5 cm long; up to about 5 mm thick; more or less equal; dry; tough; finely hairy or finely velvety; buff above, but colored like the cap or darker below; with a very slight, fuzzy, swollen knob at the point of attachment to the wood.
Flesh: Whitish to brownish; thin; tough.
Odor and Taste: Not distinctive.
Chemical Reactions: KOH olive on cap surface.
Spore Print: Creamy white.
Microscopic Features: Spores: 10-12 × 3-4.5 µ; smooth; lacrymoid to elliptical; inamyloid. Pleurocystidia absent. Cheilocystidia usually abundant, but soon collapsing and often difficult to differentiate (sometimes requiring several mounts); often swollen; saccate to fusoid-ventricose; occasionally somewhat lobed and/or diverticulate; to about 60 × 25 µ. Pileipellis a tangled cutis of cylindric elements 3-11 µ wide, frequently encrusted (in bands or spirals) with brownish pigment in KOH, with occasional “thumbs” and branchlets