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Clitocybe nebularis

[Basidiomycetes > Agaricales > Tricholomataceae > Clitocybe...]

by Michael Kuo

Clitocybe nebularis is a medium-sized to large, conifer-loving clitocyboid mushroom from western North America. It features a cloudy gray cap, a foul odor, and a yellowish spore print.

Kuyper (1995) places Clitocybe robusta in synonymy with Clitocybe nebularis var. alba, as does Bigelow (1982); however, Bigelow elevates Clitocybe robusta to species status. My humble opinion, for what it's worth, is that Bigelow and Kuyper have different mushrooms in mind. Kuyper treats gray and white varieties of Clitocybe nebularis, which he says are often found growing together in the Netherlands, while Bigelow treats two very distinct mushrooms from western North America.


Ecology: Saprobic; growing alone, scattered, or gregariously under conifers; fall and winter (in coastal climates); primarily distributed in western North America, but reported from Michigan.

Cap: 4-25 cm; convex, flat, shallowly depressed, or irregular and distorted; dry or moist; hoary, finely hairy, or relatively smooth; gray to brownish gray; the margin inrolled at first and later wavy, sometimes lined.

Gills: Broadly attached to the stem or beginning to run down it; close; creamy.

Stem: 5-15 cm long; up to 4 cm thick; with an enlarged base; dry; fairly smooth, or with tiny brownish fibers; white to cream; dingy when handled; with white basal mycelium.

Flesh: White; thick.

Odor and Taste: Foul, mealy, or sickly sweetish.

Spore Print: Pale yellowish.

Chemical Reactions: KOH on cap surface negative.

Microscopic Details: Spores 5.5-8.5 x 3-4.5 µ; more or less elliptical; smooth; inamyloid. Cystidia absent. Clamp connections present.

REFERENCES: (Batsch, 1789) Kummer, 1871. (Fries, 1821; Saccardo, 1887; Smith, 1975; Smith, Smith & Weber, 1979; Bigelow, 1982; Arora, 1986; Lincoff, 1992; Kuyper (1995); Miller & Miller, 2006.) Herb. Kuo 01110607.

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


Clitocybe nebularis

Clitocybe nebularis

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Kuo, M. (2008, April). Clitocybe nebularis. Retrieved from the MushroomExpert.Com Web site: