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Tricholoma squarrulosum

[ Basidiomycetes > Agaricales > Tricholomataceae > Tricholoma . . . ]

by Michael Kuo

One of many gray species in the genus, Tricholoma squarrulosum may be able to Tricholoma, but lomas are not very observant and they get bored easily. You, on the other hand, will not be tricked, since you will notice the fibers and scales on the cap and the stem--as well as the mealy odor and taste, the grayish gills, and the growth under hardwoods in the Great Lakes region.


Ecology: Mycorrhizal with various hardwoods; growing alone, scattered, or gregariously; fall; Great Lakes region.

Cap: 2-10 cm; broadly convex to nearly flat when mature; dry; grayish underneath a dense covering of dark gray to nearly black fibers and scales; the margin inrolled and hairy when young.

Gills: Attached to the stem by a notch; close; whitish to dull grayish, often becoming flushed with pink in areas; not infrequently discoloring gray on the edges.

Stem: 4-8 cm long; .5-1.5 cm thick; more or less equal, or somewhat swollen below; with gray to nearly black fibers and scales over a grayish to whitish ground color; dry.

Flesh: Pale grayish; not changing on exposure.

Odor and Taste: Mealy to disagreeably mealy.

Spore Print: White.

Chemical Reactions: KOH on cap surface negative.

Microscopic Features: Spores 6-7 x 3.5-5 µ; smooth; elliptical; inamyloid. Pleurocystidia and cheilocystidia absent. Pileipellis a cutis of cylindric elements 4-14 µ wide; not gelatinized; hyaline to blackish brown in KOH. Clamp connections absent.

REFERENCES: Bresadola, 1892. (Saccardo, 1902; Smith, Smith & Weber, 1979; Ovrebo, 1980; McNeil, 2006.) Herb. Kuo 09120502.

Tricholoma michiganense and Tricholoma atrosquamosum var. squarrulosum are synonyms. The latter name is preferred by many European mycologists and is the correct name according to the Index Fungorum--but I am following North American Tricholoma experts Ovrebo (1980, 1989) and Shanks (1994).

Further Online Information:

Tricholoma squarrulosum at Roger's Mushrooms


Tricholoma squarrulosum

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Kuo, M. (2008, December). Tricholoma squarrulosum. Retrieved from the MushroomExpert.Com Web site: