Cap 3 – 5.5 cm, margin undulate, stem equal, 3 – 6 mm wide, often flattened, with white mycelium at the base, pruinose at apex.

Odor unpleasant, like rubber. Under Abies religiosa and pine.

Lamellar cystidia absent, gill edge with basidia. Basidia 4 spored. Spores nodulose, (6.7) 6.9 - 8.4 (8.8) × (4.3) 4.7 - 5.4 (5.9) µm
Q = (1.2) 1.4 - 1.7 (1.8) ; N = 15
Me = 7.6 × 5.1 µm ; Qe = 1.5