Little brown mushroom

Cap: (1)1.5— 3.5(4) cm, Campanulate then convex to plane, obtuse, dingy gray to blackish, often with reddish or hazel tones, hygrophanous, pallid grey to yellowish when dry, smooth, with a narrow brown marginal band, slightly striate at the margin when moist. Flesh thin and grayish. Gills: Adnate, close to crowded, at first gray-olivacous, becoming mottled and darkening to black with age, edges remaining whitish. Spores: Blackish gray. Stipe: (4)6 — 8(10) cm x 1 — 2(3) mm, equal, slender, slightly enlarging at the base, hollow, fragile, dingy white to clay, becoming brownish towards the base in age, smooth, white-pruinose at the apex, obsoletely slightly silky-striate, ring absent. Flesh is dirty ochraceous-buff; fragile. Taste: Not distinctive. Odor: Not distinctive. Microscopic features: Spores 10.8 — 14.2 X 6.9—9.5, ellipsoid or lemon shaped, basidia 4 spored. Gill edge cystidia fusiform, typically with long necks, gill face cystidia absent.