Tricholoma terreum Peck 1912
"Dirty Trich” Conical bcmg flat with radial striations, mouse gray-brown, often umbonate. Gills wide, white becoming gray. Stipe short, thick, white becoming grayish. Apex floccose. White spore print. Large groups in conifer woods. Good eating. Common in some places. Has poisonous look-alikes. It is in the Tricholomataceae family of the Agaricales order.