The North American Species of Crepidotus

123. Crepidotus pallidoluteus sp. nov.

Illustration: Fig. 200.

Pileus 5-12 mm latus, sessilis, "warm buff" ad margines, basi ochraceoobscurus demum brunneus, fibrillosus. Lamellae confertae, latae, pallidae deinde obscurae, marginibus fimbriatae. Sporae 6-8 x 4-5 µ, ellipsoideae, punctatae. Basidia 22-26 x 5-6 µ, tetraspora. Pleurocystidia desunt; cheilocystidia 27-40 x 3-9 µ. Cuticula ex hyphis repentibus composita, hyphas erectas sine colorae gerens, 2-4 (7) µ latas. Fibulae adsunt. Specimen typicum in Herb. Univ. Mich.; lectum in Cheboygan County, Mich., July 11, 1956, H. D. Thiers 3123.

Pileus 5-12 mm broad, sessile, more or less convex, expanding, warm buff toward the margin, ochraceous tawny to brown at the base, villose or tomentose. Context thin, pallid; odor and taste not distinctive.

Lamellae close, broad, edges fimbriate, pallid then tawny.

Spores 6-8 x 4-5 µ, ellipsoid, inequilateral in profile, punctate, pale yellowish-brown in 2% KOH. Basidia 22-26 x 5-6 µ, 4-spored. Pleurocystidia none; cheilocystidia 27-40 x 3-9 µ, filamentous or more often clavate, cylindric, ventricose or flask-shaped. Gill trama slightly interwoven, hyphae 4-7 µ broad. Pileus trama interwoven. Cuticle of repent hyphae, bearing a turf of colorless hyphae, 2-4 (7) µ broad, at times broader. Clamp connections present.

Habit, Habitat, and Distribution: On logs, in hemlock forest, Michigan and Montana, July-August.

Material Studied: MICHIGAN: Beach (MICH) 20; Thiers (MICH) 3123, type, from Camp Creek, Cheboygan County, July 11, 1956; MONTANA: Cooke 32217.

Observations: This differs from C. croceitinctus and C. subcroceitinctus in its buff color, its ellipsoid spores, and its more simple organization of the cuticle.