The North American Species of Crepidotus

72. Crepidotus roseibrunneus sp. nov.

Illustration: Fig. 145.

Pileus 4-8 mm latus, sessilis, ungulatus, se extendens, avellaneus, albo-fibrillosus, margine villosus, incurvatus. Lamellae confertae, latae, pallidae deindefuscae. Sporae 6-8 x 4-5 µ, ellipsoideae, punctatae. Basidia 23-28 x 5-6 µ tetraspora. Pleurocystidia desunt; cheilocystidia 34-55 x 4-9 µ. Cuticula ex hyphis repentibus composita, hyphas erectas sine colore gerens. Fibulae adsunt. Specimen typicum in Herb. Univ. Mich.; lectum in Tahquamenon Falls State Park, Mich., July 9, 1951, A. H. Smith 36814.

Pileus 4-8 mm broad, sessile, ungulate, expanding, white-fibrillose, avellaneous, margin villose, incurved.

Lamellae close, broad, pallid then tawny, edges fimbriate. Stipe none, or only a pseudostipe.

Spores 6-8 x 4-5 µ, ellipsoid, inequilateral in profile, punctate. Basidia 23-2 x 5-6 µ, 4-spored. Pleurocystidia none; cheilocystidia 34-55 x 4 -9 µ, clavate, subcylindric, more or less bottle-shaped, apices obtuse, more rarely appendiculate. Gill trama subparallel, hyphae 4-7 µ broad. Pileus trama interwoven. Cuticle of repent hyphae, bearing numerous, more or less erect hyphae. Clamp connections present.

Habit, Habitat, and Distribution: On hardwood, Michigan, July.

Material Studied: MICHIGAN: Smith 36814, type, from Tahquamenon Falls State Park, July 9, 1951.

Observations: This is somewhat related to C. payettensis, which is glabrous, and has slightly broader spores. It differs from C. kauffmanii, which has brown, incrusted hyphae on the pileus.