North American species of Crepidotus, by L.R. Hesler and Alexander H. Smith.

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North American Species of Crepidotus

Spores 5-7.5 IL in diameter, globose, punctate, "Sayal brown" to cinnamon brown in deposit. Basidia 24-36 X (6)7-9(12),, 2-4-spored (rarely
1-spored. Pleurocystidia (24)35-62 X 5-12,, versiform: clavate, at times
mucronate or appendiculate, or ventricose, more rarely capitate; cheilocystidia 24-48(55) X 5-11 A, clavate to ventricose. Gill trama subparallel to
interwoven, hyphae 5-9(17) p broad. Pileus trama loosely interwoven. Cuticle of repent hyphae, at times poorly differentiated, with or without pilocystidia. Clamp connections present.
HABIT, HABITAT, AND DISTRIBUTION: On logs of hardwood. Maine,
Massachusetts, Michigan, New York, North Carolina, and Tennessee,
June-October.
MATERIAL STUDIED: MAINE: Bigelow 10570 (MASS); MASSACHUSETTS: Bigelow 6824, 6825 (MASS); MICHIGAN: Beach 32 (MICH);
Smith 33-1003, 41605, 61026, 66278, 66851, 66853, 66854 (type, from Colonial Point Hardwoods, July 22, 1963), 66856, 67073; Thiers 2668, 2785,
3362 (MICH); NEW YORK: Deegan 81 (MICH); NORTH CAROLINA: Hesler 4331, 5116, 19157, 25528; TENNESSEE: Hesler 24946,
25811.
OBSERVATIONS: This resembles C. malachius var. malachius from which it
is distinguished by the pleurocystidia.

FIG. 4. C. cystidiosus