The North American Species of Crepidotus

49. Crepidotus cuneiformis Pat., Bull. Soc. Myc. Fr. 18: 173. 1902.

Illustration: Fig. 106.                                                 

Pileus 5-15 mm broad, sessile, reniform to flabelliform, base cuneate, pale brown, glabrous, dry, margin striatulate when wet. Context soft, watery; taste mild.

Lamellae radiating, broad, close, at first pallid, then brownish, edges serrulate.

Spores 5.4-7 µ in diameter, globose or subglobose, finely punctate, brown in 2% KOH. Basidia 20-24 x 7-8 µ, 4-spored. Pleurocystidia none; cheilocystidia 28-40 x 7-13 µ, clavate, few, collapsed against the edges, inconspicuous. Gill trama subparallel, hyphae 5-7 µ broad. Pileus trama interwoven. Cuticle composed of a zone of three to five layers of repent hyphae, 5-7 µ broad, with occasional erect colorless hyphae.

Habit, Habitat, and Distribution: On hardwood logs, Guadeloupe, Michigan, and Texas, June-July.

Material Studied: GUADELOUPE: Patouillard, No. 31 (405), type (FH); MICHIGAN: Smith 41548, 49609, 49625, 49641, 63673, 66386; TEXAS: Thiers 1885 (MICH).

Observations: The description of microscopic characters above is based on a study of the type. The Michigan and Texas collections showed areas of erect hyphae which formed a turf, the terminal elements of which were pileocystidia . The multi-layered cuticle is characteristic, along with spore size and the shape of the cheilocystidia.