The North American Species of Crepidotus

76. Crepidotus fusisporus var. abietinus var. nov.

Illustration: Fig. 149.

Pileus 8-15 mm latus, sessilis,flabelliformis demum cucullatus, peralbus, planus. Lamellae pallido-brunneae, confertae, medio-latae. Sporae (7) 8.5-12 x (3) 3.5-4.5 (5) µ, fusoideae, punctatae. Basidia 22-27 x 5-6 µ, tetraspora. Pleurocystidia desunt; cheilocystidia 22-45 x 5-11 µ. Cuticula ex hyphis repentibus composita, hyphas sine colore gerens, 2-3 µ latas. Fibulae adsunt. Specimen typicum in Herb. Univ. Mich., lectum prope Wagner's Falls, Mich., Sept. 7, 1933, A. H. Smith 33-902.

Pileus 8-15 mm broad, sessile, fan-shaped or cucullate, pure white, cottony and dull, slightly tomentose near the base, margin not at all striate.

Lamellae attached to a substipitate point on the lower side, very pale brown, thin, close, moderately broad.

Spores (7) 8.5-12 x (3) 3.5-4.5 (5) µ, fusoid, pointed at both ends, punctate, clinging in 2's, 3's, or 4's, smooth or nearly so. Basidia 22-27 x 5-6 µ, 4-spored. Pleurocystidia none; cheilocystidia 22-45 x 5-11 µ, clavate to ventricose, at times capitate. Gill trama interwoven, hyphae 5-10 µ broad. Pileus trama interwoven. Cuticle of repent hyphae, bearing a turf of colorless, straight hyphae, 2-3 µ broad. Clamp connections present.

Habit, Habitat, and Distribution: On dead twigs of Abies, Michigan, September.

Material Studied: MICHIGAN: Smith 33-902, type, from Wagner's Falls, Sept. 7, 1933.

Observations: The spores of this variety range longer than in any of the other varieties of C. fusisporus.