The North American Species of Crepidotus

81. Crepidotus fusisporus var. simplex var. nov.

Pileus 4-20 mm latus, sessilis, conchatus demumflabelliformis, albus, pubescens, margine involutus. Lamellae medio-latae, confertae velpaene subdistantes. Sporae 7-9.5 x 3.7-4.6 (5) µ fusoideae vel subfusoideae, punctatae, saepe subleves. Basidia 26 -30 x 6-7 µ tetraspora. Pleurocystidia desunt; cheilocystidia 25-36 x 5-8 µ. Cuticula ex hyphis repentibus composita, hyphas erectas saepe sinuosas vel in spiram volutas gerens. Fibulae adsunt. Specimen typicum in Herb. Univ. Mich.; lectum in Tahquamenon Falls State Park, Mich., Aug. 9, 1963, A. H. Smith 67100.

Pileus 4-20 mm broad, sessile, conchate to flabelliform, white, pubescent or villose, opaque, margin inrolled.

Lamellae medium broad, moderately close or at times nearly subdistant.

Stipe absent, or present and small, inconspicuous, and disappearing.

Spores 7-9.5 x 3.7-4.6 (5) µ, fusoid or subfusoid, obscurely punctate, often nearly smooth, pale yellowish, clinging together in 2's, 3's, or 4's. Basidia 26-30 x 6-7 µ, 4-spored. Pleurocystidia none; cheilocystidia 25-36 x 5-8 µ, clavate to slightly bottle-shaped. Gill trama interwoven, hyphae 5-8 µ broad. Pileus trama interwoven. Cuticle of repent hyphae, bearing a turf of long, narrow (3-5 µ), colorless hyphae, often crooked or coiled, especially on the margin. Clamp connections present.

Habit, Habitat, and Distribution: On sticks, New Hampshire, Michigan, and Oregon, July-August, and November.

Material Studied: MICHIGAN: Smith 37780, 49683, 67100 (type, from Tahquamenon Falls State Park, Aug. 9, 1963); Thiers 3119 (MICH); NEW HAMPSHIRE: Miller 280 (MICH); OREGON: Zeller 7829 (MICH).

Observations: This variety is characterized by its regularly-shaped cheilocystidia and crooked or coiled epicuticular hyphae.