The North American Species of Crepidotus
106. Crepidotus subsphaerosporus (Lange), Kühner & Romagn. Fl. Anal. Champ. Supérieurs, p. 76. 1953.
Crepidotus variabilis var. subsphaerosporus Lange, Dansk Botanisk Archiv. 9: 52. 1938.
Illustration: Fig. 180.
Pileus 4-12 mm broad, white, dry, fibrillose or villose, flabelliform to suborbicular.
Lamellae close or nearly subdistant, medium broad, white then vinaceous or pinkish cinnamon to clay brown, edges even or slightly fimbriate.
Stipe none, or inconspicuous and temporary.
Spores 5-7 (8) x 4-5.5 (6) µ, ellipsoid or subsphaerical, more rarely ovoid, slightly inequilateral in profile, punctate-echinulate. Basidia (20) 26 -32 x 5-6 µ, 4-spored. Pleurocystidia none; cheilocystidia 23-50 x 5-9 (11) µ, clavate to cylindric, ventricose, occasionally more or less forked, often subcapitate. Gill trama subparallel to slightly interwoven, hyphae 4-10 µ broad. Pileus trama interwoven. Cuticle of repent, dingy hyphae with scattered or gregarious, erect hyphae, 4-8 µ broad, forming more or less of a turf. Clamp connections present.
Habit, Habitat, and Distribution: On hardwood and conifer wood, New York, Michigan, Colorado, Idaho, California, and Washington, June–December; also Europe.
Material Studied: CALIFORNIA: Smith 56652, 56709, 56770; COLORADO: Smith 52227; IDAHO: Smith 54061, 54338; MICHIGAN: Beach 9a (MICH); Smith 63589, 63590, 66826, 66862, 66864, 66865a, 66868, 66871, 66875, 66876, 66916; NEW YORK: Deegan A2 (MICH); WASHINGTON: Smith 14612.
Observations: This species is related to C. variabilis, as Lange concluded, and he gave it varietal status. The spores, however, are sufficiently distinct from those of C. variabilis so that we agree with Kühner and Romagnesi (1953) in giving it the status of an autonomous species.