The North American Species of Crepidotus

59. Crepidotus subfibrillosus sp. nov.

Illustrations: Figs. 123, 124.

Pileus 3-10(15) mm latus, sessilis, flabelliformis, primum subfibrillosus, deinde glabrosus, "cinnamon buff" vel "pinkish buff" denique atro-brunneus, striatus. Lamellae primum pallide avellaneae, deinde "clay color," confertae, latae. Sporae 5-6 (7) µ, globosae vel subovoideae, punctatae vel subechinulatae. Basidia 17.5-22 x 5-6.5 µ, di- et tetraspora. Pleurocystidia 30-43 x 5-7 µ; cheilocystidia 30-55 x 5-8 µ. Cuticula ex hyphis repentibus composita, hyphas non-incrustatas brunneas et sine colore gerens. Fibulae adsunt. Specimen typicum in Herb. Univ. Mich.; lectum in Cheboygan County, Mich., June 29, 1949, A. H. Smith 32367.

Pileus 3-10(15) mm broad, sessile, flabelliform, at first pale-rusty-subfibrillose, soon glabrous over the marginal area or entirely, surface faintly "cinnamon buff" or "pinkish buff," in age dark brown, margin translucent-striate.

Lamellae more or less adnate on the pseudostipe, at first pallid avellaneous, finally pale clay color, close, broad, edges even.

Spores 5-6 (7) µ in diameter, globose or subovoid, punctate or subechinulate, wall double, brown. Basidia 17.5-22 x 5-6.5 µ, 2-4-spored. Pleurocystidia 30-43 x 5-7 µ, clavate-mucronate or ventricose with a rounded apex; cheilocystidia 30-55 x 5-8 µ, clavate, ventricose, at times more or less constricted. Subhymenium of more or less globose cells. Gill trama parallel to subparallel, cells short or long, hyphae 5-10 µ broad. Pileus trama interwoven. Cuticle of repent hyphae, bearing both non-incrusted brown and colorless hyphae. Clamp connections present.

Habit, Habitat, and Distribution: On log of Fraxinus, Michigan, June.

Material Studied: MICHIGAN: Smith 32367, type, from Wolf Bog, Cheboygan County, June 29, 1949.

Observations: This is characterized chiefly by the pileus colors, the pale avellaneous gills, the pleurocystidia, and the brown, non-incrusted, epicuticular hyphae.