The North American Species of Crepidotus

32. Crepidotus hygrophanus Murr., North Amer. Flora 10: 150. 1917.

Illustration: Fig. 85.

Pileus 1-2 cm broad, sessile, dimidiate, convex-plane, hygrophanous, whitish, becoming nearly fulvous on drying, glabrous, minutely striate over the lamellae, more conspicuously striate when dried. Context soft, fleshy; taste mild.

Lamellae broad, close, thin, entire.

Stipe none, pileus attached by a white tuft of mycelium.

Spores 5-6 (7) µ, globose, more rarely slightly subglobose, punctate. Basidia 24-28 x 6-7 µ, 4-spored. Pleurocystidia none; cheilocystidia 28-48 x 5-10 µ, clavate, at times somewhat ventricose and capitate, more rarely slightly constricted. Gill trama subparallel, hyphae 4-7 µ broad. Pileus trama interwoven. Cuticle repent, often of several layers of hyphae, at times with some erect hyphae. Clamp connections on the epicuticular hyphae.

Habit, Habitat, and Distribution: On hardwood logs, New Hampshire, New York, and Michigan, July.

Material Studied: MICHIGAN: Smith 61031; NEW HAMPSHIRE: Bigelow 11853 (MASS); NEW YORK: Murrill 236, type, from Lake Placid, July 17-29, 1912 (NY).

Observations: As in many Crepidotus collections, the pileus appears glabrous, but sections examined microscopically show scattered, erect hyphae. In this species these hyphae and those of the cuticle are colorless. On drying it becomes fulvous, a character not shown by C. malachius. The description above is based on a study of the type.