The North American Species of Crepidotus

36. Crepidotus praelatifolius Murr., Bull. Torrey Club 67: 230. 1940.

Illustration: Fig. 89.

Pileus 1-2 mm broad, sessile, dimidiate or conchate to resupinate, imbricate, often laterally confluent, white, unchanging, with long white delicate hairs, margin even. Context white, membranous. Becoming inconspicuous at maturity.

Lamellae very few, very broad, pallid to fulvous, becoming folded and irregular with age.

Spores 4.5-6 µ, globose or ovoid, punctate, brownish in 2% KOH. Basidia 16-22 x 6-7 µ, 4-spored. Pleurocystidia none; cheilocystidia 32-48 x 4-9 µ, cylindric, or more often obclavate to flask-shaped, rarely fusiform. Gill trama of subparallel hyphae, 3-6 µ broad. Cuticle of repent hyphae, often bearing more or less erect, long, loosely tangled hyphae (2-3 µ broad), forming a turf. Clamp connections present.

Habit, Habitat, and Distribution: On magnolia log, Florida, September.

Material Studied: FLORIDA: Murrill F18107, the type (FLAS), collected by A. S. Rhoads, on magnolia log, Gainesville, Sept. 8, 1938.

Observations: The description of microscopic characters above is based on a study of the type. As Murrill (1940) points out, the tiny caps are little more than tufts of hairs holding the few large gills in position. It differs from C. latifolius chiefly in its cheilocystidia.