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Clitocybe eccentrica

[Basidiomycota > Agaricales > Tricholomataceae > Clitocybe . . . ]

by Michael Kuo

One of a handful of wood-inhabiting clitocyboid mushrooms, Clitocybe eccentrica can be recognized by its habitat (clustered growth in summer and fall on the deadwood of hardwoods east of the Rocky Mountains); the presence of long, pointy hairs near the base of the stem; the white rhizomorphs extending into the substrate; the bitter taste; and the small, brownish cap, which develops splits and lobes as it matures.

A very similar species is Rhizocybe species 01, which appears in the spring and features a paler, nearly whitish cap and a less strigose stem base; additionally, specimens of Rhizocybe species 01, when dried for the herbarium, are pale cream colored, while Clitocybe eccentrica specimens turn brown. The "Clitocybe eccentrica" featured here for many years, and featured in Mushrooms of the Midwest (Kuo & Methven 2014) is actually Rhizocybe species 01.


Ecology: Saprobic; growing gregariously or in clusters on the deadwood or woody debris of hardwoods; summer and fall; originally described from Vermont; widely distributed in the midwestern and eastern United States, from roughly Interstate 70 northward. The illustrated and described collections are from Illinois.

Cap: 2–5 cm across; shallowly vase-shaped, becoming more vase-shaped with development; thin; dry; bald; brown to watery yellowish brown, fading to buff or whitish; the margin frequently inrolled at first; often becoming lobed and split with development.

Gills: Running down the stem; crowded; shallow; short-gills frequent; whitish.

Stem: 2–4.5 cm long; 2–6 mm thick; often a little off-center; more or less equal; dry; bald above, but densely hairy ("strigose") at the base; with white rhizomorphs attached.

Flesh: Thin; tough; whitish.

Odor and Taste: Odor not distinctive; taste bitter.

Chemical Reactions: KOH and iron salts negative on cap surface.

Dried Specimens: Cap, gills, and stem brown.

Spore Print: White.

Microscopic Details: Spores 3.5–5 x 2–3.5 µm; ellipsoid; with a tiny apiculus; smooth; hyaline in KOH; inamyloid; not adhering in groups. Basidia 23–26 x 4–5 µm; subclavate; 4-sterigmate. Cystidia not found. Pileipellis a cutis of elements 3–7.5 µm wide, smooth, hyaline to yellowish in KOH; clamp connections present.

REFERENCES: C. H. Peck, 1898. (Kauffman, 1918; Bigelow, 1982; McNeil, 2006.) Herb. Kuo 08070903, 06171401.

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


Clitocybe eccentrica

Clitocybe eccentrica

Clitocybe eccentrica

Clitocybe eccentrica

Clitocybe eccentrica
Dried specimens

Clitocybe eccentrica

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Kuo, M. (2021, October). Clitocybe eccentrica. Retrieved from the MushroomExpert.Com Web site: