Cap: 2-5,5 cm across, first hemispherical, later convex to plane, sometimes with an obtuse umbo, in wet clay buff to cinnamon, when drying pale gray yellow to yellowish brown in center, against margin pale pinkish buff, margin is incurved for a long time, acute, even.
Hymenophore: lamellae are white, broad, notched and narrow attached, edges are white floccose, little crenate, with brown spots from dried guttation drops.
Spore print: brown
Spore: amygdaliform, weakly verrucose, 10-15 x 5,2-8 μm
Stem: 2-6 x 0,4-0,8 cm, cylindric, young solid, old pithy hollow, young whitish, later is apex white floccose, longitudinally fibrillose and browning from the base upward.
Flesh: whitish, thin, odor is cocoa like, with a raphanoid component, taste is bitter.
Habitat: gregarious under poplar or birch, in moist places, grows from summer to fall.
Remarks: similar with Hebeloma crustuliniforme, with bigger spores.