Pileus (Cap): (5-) 10-15 (-250mm in diameter, conic or convex to campanulate, subumbonate or umbonate, frequently with papilla (1-2 mm high, even and more or less glabrous, lubricous, striate at the margin when moist, sometimes somewhat wrinkled, strongly hygrophanous, dark reddish brown, brown chocolate or grayish brown, fading to brownish yellow, olivaceous, yellow or grayish green; turning blue when handled, sometimes becoming and remaining bluish black.
Lamellae (Gills): adnexed, or somewhat sinuate, grayish to reddish brown, gray violaceuos or dark, violaceous, somewhat spotted, whith white edges.
Stipe (Stem): 40-60 x 0.7-2mm, cylindric, equal or somewhat subbulbous, hollow, flexuous, cartilaginous, reddish brown but more paler at the apex; whitish mycelium present towards the base; covered with white floccose fibrils on the margin of the pileus, as small apendices.
Microscopic features: Spores dark Purple-Brown 5.5-6 x 4.9-5.5um, subrhomboid in face veiw. subellipsiod in profile veiw, smooth, thick walled dark yellowish brown with a broad germ pore. Basidia 11-20x 4.5-6.5 4 spored or 2 spored, hyaline, ventricose cylindric or cylindric pyriform. Pleurocystidia scanty difficult to find when they are present they are 13-17 x 5-6um, subfusiform or sublageniform and hyaline. Cheilocystidia 6-15 um long. abundant hyaline, obclavate with long neck, 1-2um thick, sometimes with a hyaline viscous drop 5-10um in diameter at the apex.
Season: July to late August
Habitat and Distribution: Restricted to the Fagus forests of Mexico. On humus rich in leaves, or sometimes between mosses. At 1850m.