The North American Species of Crepidotus

77. Crepidotus fusisporus var. longicystis var. nov.

Illustration: Fig. 150.

Pileus 10-22 mm latus, sessilis, albus, fibrillosus. Lamellae confertae, mediolatae. Sporae 7-10 x 3.5-5 µ, fusoideae vel subfusoideae, punctatae. Basidia 24 -30 x 5-6 (7) µ, di- et tetraspora. Pleurocystidia desunt; cheilocystidia 29-60 x 3-16 µ. Cuticula ex hyphis repentibus composita, hyphas erectas sine colore gerens, 2-3.5 µ latas. Fibulae adsunt. Specimen typicum in Herb. Univ. Mich.; lectum in Cheboygan County, Mich., July 7, 1949, A. H. Smith 32464.

Pileus 10-22 mm broad, sessile, whitish, "light buff" when dried, fibrillose or villose, white-tomentose at base.

Lamellae close, medium broad, edges fimbriate.

Spores 7-10 x 3.5-5 µ, fusoid or subfusoid, inequilateral in profile, obscurely punctate. Basidia 24-30 x 5-6 (7) µ, 2-4-spored. Pleurocystidia none; cheilocystidia 29-60 x 3-16 µ, filamentous, or cylindric and at times capitate, ventricose, or irregularly flexuous-clavate. Gill trama slightly interwoven, hyphae 4-6 µ broad. Pileus trama interwoven, often loosely so. Cuticle of repent hyphae, bearing a turf of colorless, straight hyphae 2-3.5 µ broad. Clamp connections present.

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

Material Studied: MICHIGAN: Smith 32464, type, from North Fish Tail Bay, Univ. Mich. Biological Station, July 7, 1949.

Observations: The exceptionally long cheilocystidia distinguish this variety from all others. The surface of the dried pileus is "light buff."