Habitat: Mixed woodlands
Conservation Status: Not of concern
Cap: 4-5.5 cm wide, broadly convex with a low umbo; surface dry, wooly over the disc, breaking up into radiating fibrils and squamules toward the margin; fibrils initially black over a very pale gray background, then becoming brownish black; margin inrolled and distinctly bearded when young, remaining incurved well into maturity, finally becoming wavy and uplifted. Flesh: pale gray; odor and taste farinaceous. Gills: emarginate to adnexed, close, moderately broad; white to very pale gray, sometimes with black edges. Stalk: 4.5-7 cm, 1-2 cm thick, nearly equal or enlarged toward the base, solid; surface dry, appressed-fibrillose to appressed-squamulose except at the apex, which is pruinose; medium gray overall; base usually carmine-red when dry.
Sources: Bessette, Alan E., Arleen R. Bessette, William C. Roody, and Steven A. Trudell. Trichoolomas of North America. Austin, University of Texan Press, 2013.
PNW Herbaria: Specimen records of Tricholoma atrosquamosum in the Consortium of Pacific Northwest Herbaria database
CalPhotos: Tricholoma atrosquamosum photos