Habitat: Woodlands
Conservation Status: Not of concern
Cap: 2.5-11 cm wide, conic when young, becoming convex to broadly convex or nearly place, often with a low, broad umbo; surface slightly viscid then dry, with densely matted fibrils over the disc, dark brown to reddish brown with paler, sometimes striate, margin; margin inrolled, often remaining so or becoming down-turned or straight. Flesh: white to buff; odor and taste farinaceous. Gills: adnate to emarginate or nearly free, close, thin; yellowish white to buff, faces becoming spotted or edge entirely reddish. Stalk: 4-15 cm long, 7-20 mm thick, equal or slightly clavate, often long relative to the cap diameter and slightly rooting, solid or hollow; surface dry, appressed-fibrillose, with occasional projecting fibrils, apex pruinose; yellowish buff to grayish orange, dull reddish brown toward the base at maturity.
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 transmutans in the Consortium of Pacific Northwest Herbaria database
CalPhotos: Tricholoma transmutans photos