Kuehneromyces mutabilis

A lignicolous species preferring beech woods, growing in large caespitose clusters, with a yellowish-brown cap and a membranous ring on the upper stipe.

Pileipellis composed of hyphae arranged more or less parallelly to interwoven, hyaline, moderately thick-walled, 3-6 µm wide, with occasional branching, septate and partially clamped.

Gill edge with abundant hair-like cheilocystidia: cylindrical, sinuous to lageniform with a long neck, 20-30 µm long and 4-6 µm wide.

Pleurocystidia absent.

Basidia clavate, 20-25 µm long and 6-8 µm wide, with basal clamps, 4-spored.

Spores ellipsoidal, smooth- and thick-walled, pale yellow under the microscope, with an inconspicuous eccentric apiculus at one end and a central truncate germ pore at the opposite pole, containing oil droplets, inamyloid in Melzer's reagent.