The North American Species of Crepidotus

55. Crepidotus campylus sp. nov.

Illustrations: Figs. 115, 116.

Pileus 5-12 mm latus, flabelliformis, subflavus, leviter squamulosus demum glabrosus, planus. Lamellae albidae deinde brunneae, confertae, medio-latae. Sporae 5-7 µ, globosae vel ovoideae, punctatae. Basidia 26-32 x 6-7 µ, di- et tetraspora. Pleurocystidia desunt; cheilocystidia 25-72 x 5-10 µ, saepe flexuosa,furcata vel nodosa. Cuticula sine discrimine, superficies hyphas erectas et pileocystidia gerens. Fibulae adsunt. Specimen typicum in Herb. Univ. Mich.; lectum prope Harbor Springs Hills, Mich., July 27, 1961, A. H. Smith 63701.

Pileus 5-12 mm broad, fan-shaped, yellowish, faintly appressed-fibrillose-squamulose to glabrous, margin even, faintly pubescent, base scarcely mycelioid. Context medium thin; taste mild.

Lamellae whitish, then brown from spores, close, medium broad, edges white-fimbriate.

Spores 5-7 µ, globose, at times 6-7 x 5-6 µ and ovoid, punctate. Basidia 26-32 x 6-7 µ, 2-4-spored. Pleurocystidia none; cheilocystidia 25-72 x 5-10 µ, mostly cylindric-capitate, often flexuous, at times clavate, more rarely forked or knobbed. Gill trama subparallel, hyphae 3-7 µ broad. Pileus trama densely interwoven. Cuticle not sharply differentiated, the surface bearing a moderately thin turf of erect hyphae, and pileocystidia which may be clavate, cylindric, capitate-appendiculate, some crooked, or nearly coiled. Clamp connections present.

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

Material Studied: MICHIGAN: Smith 63701, type, from Harbor Springs Hills, July 27, 1961.

Observations: The yellow pileus, crooked to curved or semi-coiled pileocystidia , and the length attained by the cheilocystidia distinguish this species.