Hygrophorus cossus

A Hygrophorus with an unpleasant odor and a stipe surface bearing numerous terminal hairs.

Pileipellis composed of filamentous, hyaline hyphae, irregularly interwoven, widely separated by gelification, 2-4 µm wide, septate with clamp connections at the septa.

Stipe surface covered with caulocystidia-like terminal hyphae in the form of cylindrical hairs clustered in tufts, with basal clamps and rounded apices.

Gill edge without differentiated elements from basidia (cystidia absent).

Basidia cylindrical, slightly clavate, 40-60 µm long and 7-9 µm wide, with basal clamps, 4-spored.

Spores ellipsoidal to oblong, smooth, hyaline, thin-walled, with an inconspicuous eccentric apiculus at one end, vacuolar internal content, inamyloid in Melzer's reagent.