Scientific name:Agrocybe firma (Peck) Singer 1940 Synonyms:Species Fungorum 06.12.2015: Agrocybe firma var. firma (Peck) Singer 1940 Naucoria firma Peck 1901 Habit of Growth:
Mushroom is not protected
Cap: 2,5-6 cm across, first convex, soon plane, with an uplifted margin if old, smooth, hygrophanous, black brown to dark red brown if wet, if dry pale yellow to ocher to olive brown, if young velutinous pruinose, margin is acute, sometimes wrinkled.
Hymenophore: lamellae are first pale gray brown, old dark brown, broad, little notched, edges are whitish flocculose.
Spore print: dark tobacco brown
Spore: elliptic, 6,1-7,6 x 3,9-4,9 μm
Stem: 2-6 x 0,3-0,5 cm, cylindric, elastic, hollow, fibrous, whitish to brownish floccose pruinose on an olive yellow background, base is with mycelium.
Flesh: if wet brown, if dry pale ocher, thin, odor is if rubbed farinaceous rancid, taste is mild to bitter, farinaceous.
Habitat: solitary, gregarious, or almost clustered in rotten wood of hardwoods, in moist locations, grows from early summer to fall.