The North American Species of Crepidotus

15. Crepidotus mollis var. beachii var. nov.

Illustrations: Figs. 54, 55.

Pileus 10-16 mm latus, sessilis, flabelliformis, pallidus, dense brunneo-fibrillosus vel tomentosus. Lamellae latae, confertae. Sporae 7-9 x 5-6 µ, ellipsoideae, planae. Basidia 20-28 x 5-6 µ, tetraspora. Pleurocystidia 20-53 x 4-12 µ; cheilocystidia 27-35 x 6-8 µ. Cuticula gelatinosa, hyphas incrustatas brunneas sine colore gerens. Fibulae desunt. Specimen typicum in Herb. Univ. Mich.; lectum prope Douglas Lake, Michigan, Beach 24.

Pileus 10-16 mm broad, sessile, flabelliform, pallid, densely brownish fibrillose or tomentose. Context thin. Lamellae broad, close, brownish at maturity. Spores 7-9 x 5-6 µ, ellipsoid, inequilateral in profile, smooth, thick-walled, brown. Basidia 20-28 x 5-6 µ, 4-spored. Pleurocystidia 20-53 x 4-12 µ, clavate to sub-spathulate, or flask-shaped with a neck which may be forked; cheilocystidia 27-35 x 6-8 µ, not abundant, flask-shaped, usually with a neck which may be sub-capitate. Gill trama subparallel, hyphae 2-5 µ broad. Pileus trama interwoven. Cuticle a gelatinous zone 40-60 µ thick, of colorless, loosely interwoven hyphae-the zone surmounted by epicuticular hyphae of two types: (a) brown, incrusted hyphae, dense or tufted, 5-8 µ broad; (b) colorless, non-incrusted, 1.5-3 (4) µ broad, the apices tapering to a rounded point. Clamp connections none.

Habit, Habitat, and Distribution: On deciduous wood, Michigan, August.

Material Studied: MICHIGAN: Beach 24 (MICH) type, from near University of Michigan Biological Station, Douglas Lake, collected by H. Beach, Aug. 6, 1955.

Observations: This differs from C. mollis var. cystidiosus in its entirely different cheilocystidia.