Major Groups > Gilled Mushrooms > Pale-Spored > Collybioid > Gymnopus dichrous


Gymnopus dichrous

[ Basidiomycetes > Agaricales > Marasmiaceae > Gymnopus . . . ]

by Michael Kuo

Gymnopus dichrous is a tough little wood decomposer, frequently found on hardwood sticks and logs from the Great Plains eastward. In dry weather it can shrivel up and become inconspicuous--only to revive when the rain returns. I have seen specimens last for months using this strategy, eventually becoming tattered and contorted. Gymnopus subnudus is a very similar species that grows on leaf littler rather than wood; it also differs microscopically.

Collybia dichrous is a synonym.


Ecology: Saprobic; growing scattered, gregariously or in loose clusters on sticks, logs, and stumps of oaks, beech, and other hardwoods; late spring through fall; widely distributed east of the Rocky Mountains.

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 x 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 x 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.

REFERENCES: (Berkeley & M. A. Curtis, 1853) Halling, 1997. (Saccardo, 1887; Halling, 1983; Halling, 2004; McNeil, 2006.) Herb. Kuo 06100303, 06100304, 07140305, 07220311, 05290403, 06031005, 09081201.

This website contains no information about the edibility or toxicity of mushrooms.


Gymnopus dichrous

Gymnopus dichrous

Gymnopus dichrous

Gymnopus dichrous

Gymnopus dichrous

Gymnopus dichrous
Spore print

Gymnopus dichrous

Gymnopus dichrous

© MushroomExpert.Com

Cite this page as:

Kuo, M. (2013, January). Gymnopus dichrous. Retrieved from the MushroomExpert.Com Web site: