The North American Species of Crepidotus

21. Crepidotus stipitatus Kauffman Agar. Mich. 1: 524. 1918.

Illustration: Fig. 64.

Pileus 1-3 cm broad, convex, suborbicular to reniform, hygrophanous, watery-white to white, glabrous, margin faintly striatulate when moist, silky when dry, margin decurved. Context white, firm, rather thick near base, thin in front; odor and taste not distinctive.

Lamellae somewhat close, rather broad, broadest near point of attachment, narrow in front, white then pale ochraceous-brown, edges entire.

Stipe 2-4 mm long, 1-1.5 mm thick, distinct, eccentric to nearly lateral, white, pruinose, villose at base, somewhat prolonged to the gills.

Spores 4.5-6.5 µ, globose, often ovoid or subovoid, minutely punctate, pale ochraceous brown in KOH. Basidia 14-20 x 4-5 µ, 4-spored. Pleurocystidia none; cheilocystidia 33-48 x 6-7 µ, clavate, subcylindric, or bottle-shaped. Gill trama subparallel, hyphae 6-10 µ broad. Pileus trama loosely interwoven. Cuticle of 6-8 layers of repent hyphae, a few free hyphal ends more or less erect as pileocystidia, 20-30 x 5-7 µ, clavate to ventricose. Clamp connections present.

Habit, Habitat, and Distribution: On rotten wood, Michigan, September.

Material Studied: MICHIGAN: Smith 66268; type, collected by L. H. Pennington, south of Ann Arbor, Sept. 11, 1907.

Observations: The description of macroscopic characters is from Kauffman (1918); microscopic characters are from the type.