Major Groups > Gilled Mushrooms > Pale-Spored > Tricholoma > Tricholoma virgatum


Tricholoma virgatum

[ Basidiomycota > Agaricales > Tricholomataceae > Tricholoma . . . ]

by Michael Kuo

Gray species of Tricholoma are numerous and numbing in their ho-hum-ishness, but Tricholoma virgatum manages (just barely) to stand out from the crowd with a combination of features:

  • Growth under conifers;
  • Bitter to acrid taste and an indistinct odor;
  • A dry, sharply conic cap that appears streaked with darker, appressed fibers;
  • A white stem that does not develop yellow tints and is not pinkish to orangish in the base when sliced.


Ecology: Mycorrhizal with conifers; growing alone, scattered or gregariously; fall (and over winter on the West Coast); fairly widely distributed in North America. The illustrated and described collections are from Colorado.

Cap: 2–8 cm; sharply conic when young, becoming broadly conic, or nearly flat with a sharp central bump; dry; gray; with darker gray, innate to appressed, radiating fibrils and streaks.

Gills: Attached to the stem by a notch; close; whitish to dull grayish; sometimes discoloring gray on the edges.

Stem: 6-10 cm long; 1-2 cm thick; equal or somewhat swollen below; with silky appressed fibers; dry; white.

Flesh: Firm; white to pale grayish; not changing on exposure.

Odor and Taste: Odor not distinctive; taste usually bitter or acrid (sometimes slowly).

Spore Print: White.

Chemical Reactions: KOH on cap surface dull orangish; on stem base pale yellow.

Microscopic Features: Spores 7–9 x 4–6 µm; broadly ellipsoid; smooth; hyaline in KOH; inamyloid. Pleurocystidia absent. Cheilocystidia basidiole-like. Pileipellis a cutis of cylindric elements 2–7.5 µm wide. Clamp connections absent.

REFERENCES: (Fries, 1818) Kummer, 1871. (Fries, 1821; Quélet, 1886; Ovrebo, 1973; Smith, Smith & Weber, 1979; Ovrebo, 1980; Arora, 1986; Ovrebo, 1989; Breitenbach & Kränzlin, 1991; Phillips, 1991/2005; Lincoff, 1992; Shanks, 1994; Barron, 1999; McNeil, 2006; Miller & Miller, 2006; Trudell & Ammirati, 2009; Bessette et al., 2013; Christensen & Heilmann-Clausen, 2013; Siegel & Schwarz, 2016.) Herb. Kuo 08110702. Herb. DBG CMS-2018-0129.

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


Tricholoma virgatum

Tricholoma virgatum

Tricholoma virgatum
Spores and basidia

© MushroomExpert.Com

Cite this page as:

Kuo, M. (2019, April). Tricholoma virgatum. Retrieved from the MushroomExpert.Com Web site: