The North American Species of Crepidotus

Ex 6. Phaeomarasmius distans (Pk.) Singer, Lilloa 13: 83. 1947.

Crepidotus distans Pk., N. Y. State Museum Ann. Rept. 44: 132. 1892.

Pileus 4-8 mm broad, convex, tawny, minutely pubescent, margin distantly sulcate-striate.

Lamellae adnate, concolorous with the pileus, broad, very distant.

Stipe eccentric, reddish-brown, minute, about 2 mm long.

Spores 10-14 x 7-9 µ, ellipsoid, smooth, with a callus at the apex, rusty colored, with a thick double wall. Basidia 27-30 x 7-9 µ, 4-spored. Pleurocystidia none; cheilocystidia 50-64 x 5-12 µ, cylindric, hair-like bulbous, usually wavy-constricted. Gill trama interwoven. Cuticle bearing dense, brown, septate, at times branched hyphae 4-6 µ broad, with ridge-like incrustations, hyphae forming a trichodermium. Clamp connections present.

Habit, Habitat, and Distribution: On bark of Crataegus tomentosa, New York, September.

Material Studied: NEW YORK: Peck, type of Crepidotus distans, collected by Peck, at Carrollton, September.

Observations: Singer (1947), after studying the type of C. distans, proposed the new combination Phaeomarasmius distans (Pk.) Sing. His move is justifiable on the grounds that this species has smooth spores with a callus but no germ-pore, and a trichodermial epicutis of brown pigmented, incrusted hyphae on the pileus surface.