 Tricholoma vernaticum is an agaric fungus of the genus Tricholoma native to the Pacific Northwest region of the United States . The fungus was originally described in 1976 as a species of Armillaria when that genus was more inclusive ; it received its current name twenty years later . The stout fruit bodies ( mushrooms ) have moist white to grayish caps ( later becoming chalky ) and white to cream-colored pinkish caps ( later becoming chocolate-scented ) . The stout fruit bodies are usually solitary, but may be the subject of a secondary distribution . The fungus is a member of the agaric family Tricholoma