The North American Species of Crepidotus

105. Crepidotus villosus sp. nov.

Illustration: Fig. 179.

Pileus (4) 10-30 mm latus, sessilis, albus, villosus, primum resupinatus deinde conchatus demumflabelliformis. Lamellae albae deinde "light pinkish cinnamon" demum "vinaceous," medio-latae, confertae velpaene subdistantes. Sporae 5.5-7.5 (8) x 4-5 (5.5) µ, ellipsoideae, punctatae. Basidia (21) 27-33 x 6-7 µ, tetraspora. Pleurocystidia desunt; cheilocystidia 30-56 (70) x 4-12 µ, contorta. Cuticula ex hyphis repentibus composita, hyphas erectas sine colore gerens, 2-5 (7) µ latas. Fibulae adsunt. Specimen typicum in Herb. Univ. Mich.; lectum prope Pellston Hills, Mich., Oct. 5, 1955, A. H. Smith 50880.

Pileus (4) 10-30 mm broad, sessile, white, villose, resupinate at first, then conchate to flabelliform, dry, unpolished, base white-mycelioid. Context soft; odor and taste mild.

Lamellae white, then light pinkish cinnamon to vinaceous, close or nearly subdistant, medium broad.

Spores 5.5-7.5 (8) x 4-5 (5.5) µ, ellipsoid, slightly inequilateral, punctate or at times somewhat echinulate. Basidia (21) 27-33 x 6-7 µ, 4-spored. Pleurocystidia none; cheilocystidia 30-56 (70) x 4-12 µ, cylindric-flexuous, clavate, often knobbed or forked (contorted). Gill trama subparallel to slightly interwoven, hyphae 3-6 µ broad. Pileus trama interwoven. Cuticle of repent hyphae, bearing a turf of colorless hyphae, 2-5 (7) µ broad. Clamp connections present.

Habit, Habitat, and Distribution: On hardwood and conifer wood, Michigan, Wyoming, Idaho, California, and Washington, July-December.

Material Studied: CALIFORNIA: Smith 56630; IDAHO: Smith 54015, 54762, 54826, 54988; MICHIGAN: Thiers 3409 (MICH); Smith 50880 (type, from Pellston Hills, Oct. 7, 1955), 50944; WASHINGTON: Smith 47698; WYOMING: Smith 35821.

Observations: This is a white, villose species, with straight (not coiled) hyphae on the pileus, with relatively small punctate to echinulate spores and somewhat contorted cheilocystidia.