The North American Species of Crepidotus

50. Crepidotus sinuosus sp. nov.

Illustrations: Figs. 107, 108.

Pileus 1-1.5 cm latus, sessilis, flabelliformis vel semiorbicularis, "orange buff” to "warm buff” vel pallido-croceus, margine involutus. Lamellae primum "orange buff" deinde luteae, confertae, latae. Sporae 5-7.5 (8) µ, globosae, punctatae. Basidia 24-33 x 6-7 µ tetraspora. Pleurocystidia desunt; cheilocystidia 26-80 x 2-8 µ. Cuticula ex hyphis repentibus composita, hyphas erectas et pileocystidia gerens. Fibulae adsunt. Specimen typicum in Herb. Univ. Mich.; lectum prope Pellston Hills, Mich., Aug. 2, 1963, Dick Homola, A. H. Smith 67003.

Pileus 1-1.5 cm broad, sessile, flabelliform or semiorbicular, orange buff to warm buff or pale croceus, becoming more ochraceous buff as the spores mature, opaque, fibrillose to pubescent, margin inrolled. Context thin, pallid buff; odor and taste none.

Lamellae at first orange buff, becoming clay color, close, broad, lax, thin, edges fimbriate.

Spores 5-7.5 (8)  µ, in diameter, globose, punctate. Basidia 24-33 x 6-7 µ, 4-spored. Pleurocystidia none; cheilocystidia 26-80 x 2-8 µ, cylindric-flexuous, crooked, somewhat strangulate, more rarely aciculate or subulate, occasionally slightly branched. Gill trama slightly interwoven to subparallel, hyphae 4-8 µ broad. Pileus trama interwoven. Cuticle of repent hyphae, bearing a turf of erect hyphae which are septate, more or less irregularly shaped, at times branched, the terminal element cystidioid and somewhat aciculate-flexuous. Clamp connections present.

Habit, Habitat, and Distribution: On hardwood logs, Michigan, August.

Material Studied: MICHIGAN: Smith 67003 (type, collected by Dick Homola, from Pellston Hills, Aug. 2, 1963); Thiers 4404 (MICH).

Observations: This species is distinguished by its orange colors, large spores, and sinuous cheilocystidia and pileocystidia .