The North American Species of Crepidotus

61. Crepidotus aureifolius sp. nov.

Illustrations: Figs. 15, 127, 128.

Pileus 1-3.5 cm latus, sessilis, semiorbicularis demum flabelliformis, pallidoflavus, fibrillis et squamis rubido-brunneus. Lamellae primum aurantiae denique brunnaceo-aurantiae, confertae, medio-latae. Sporae 5-7.5 µ, globosae, punctatae. Basidia 23-28 x 6-7 µ, di- et tetraspora. Pleurocystidia 25-50 x 6-8 (11) µ; cheilocystidia 24-45 x 4-8 µ. Cuticula ex hyphis repentibus composita, hyphas incrustatas brunneas et sine colore gerens. Fibulae adsunt. Specimen typicum in Herb. Univ. Mich.; lectum prope Haven Hill, Mich., Sept. 1, 1963, A. H. Smith 67333.

Pileus 1-3.5 cm broad, sessile, semiorbicular to flabelliform, pale yellow, with reddish-brown fibrils or fibrillose scales. Context moderately thin; taste mild.

Lamellae at first orange, finally brownish-orange, close, medium broad.

Spores 5-7.5 u in diameter, globose, punctate. Basidia 23-28 x 6-7 µ, 2-4-spored. Pleurocystidia 25-50 x 6-8 (11) µ, cylindric-clavate or ventricose, with a short or long neck (appendiculate); cheilocystidia 24-45 x 4 -8 µ, clavate, cylindric, or ventricose, at times slightly constricted. Gill trama subparallel to slightly interwoven, hyphae 3-8 µ broad. Pileus trama interwoven, often loosely so. Cuticle of repent hyphae, bearing a turf of both brown, incrusted, and colorless hyphae. Clamp connections present.

Habit, Habitat, and Distribution: On hardwood logs, Michigan and Tennessee, July-September.

Material Studied: MICHIGAN: Beach 28, 31 (MICH); Smith 36934, 49471, 67096, 67333 (type, Haven Hill, September 1, 1963); TENNESSEE: Hesler 24912, 25732.

Observations: The bright orange gills, and the pleurocystidia are characteristic of this species. It is close to C. crocophyllus, which lacks pleurocystidia. In the Tennessee collections, the color of the gills was more yellowish and less brilliant than in the type.