The North American Species of Crepidotus

97. Crepidotus lagenicystis sp. nov.

Illustration: Fig. 169.

Pileus 6-9 mm latus, sessilis, conchatus demum dimidiatus, cinereo-albus, fibrillosus, margine incurvatus. Lamellae medio-latae, paene subdistantes, marginibus albofimbriatae. Sporae 6-8 x 4.5-5.5 µ, ellipsoideae vel ovoideae, punctatae. Basidia 24-32 x 6-8 µ, di- et tetraspora. Pleurocystidia desunt; cheilocystidia 48-65 x 7-13 µ, lageniformia demum obclavata. Cuticula ex hyphis repentibus composita, hyphas erectas sine colore, sinuosas et in spiram volutas gerens, 1.5-3 µ latas. Fibulae adsunt. Specimen typicum in Herb. Univ. Mich.; lectum in Mt. Rainier National Park, Washington, July 12, 1948, Imshaug 255.

Pileus 6-9 mm broad, sessile, conchate to dimidiate, ashy-white, densely villose to tomentose throughout, including the incurved margin.

Lamellae medium broad, nearly subdistant, edges white-fimbriate.

Spores 6-8 x 4.5-5.5 µ ellipsoid to ovoid, inequilateral in profile, obscurely punctate. Basidia 24-32 x 6-8 µ, 2-4-spored. Pleurocystidia none; cheilocystidia 48-65 x 7-13 µ, lageniform to obclavate with a long neck. Gill trama subparallel, hyphae 5-8 µ broad. Pileus trama interwoven. Cuticle of repent hyphae, bearing a turf of slender (1.5-3 µ), colorless hyphae which often are crooked or coiled. Clamp connections present.

Habit, Habitat, and Distribution: On wood, California and Washington, July.

Material Studied: CALIFORNIA: Cooke 34192; WASHINGTON: Imshaug 255 (MICH), type, from Mt. Rainier National Park, July 12, 1948.

Observations: The large, conspicuous, lageniform cheilocystidia, together with the white silky pileus, and crooked or coiled epicuticular hyphae are distinguishing characters. Crepidotus submollis has straight epicuticular hyphae and different cheilocystidia.