The North American Species of Crepidotus

42. Crepidotus confertus sp. nov.

Illustration: Fig. 98.

Pileus 2-6 mm latus, sessilis, cuneatus vel spatulatus, fuscus, alutaceus vel obscuro-cinnamomeus, glabrosus, margine planus. Lamellae angustae, confertae vel densae, albae deinde brunnaceae. Sporae 4-5.5 µ, globosae demum subovoideae, punctatae. Basidia 19-28 x 5-6 µ, tetraspora. Pleurocystidia desunt; cheilocystidia 22-48 x 4-11 µ. Cuticula ex hyphis repentibus composita, pileocystidia 30-74 x 6-12 µ. Fibulae adsunt. Specimen typicum in Herb. Univ. Mich.; lectum prope Pellston, Mich., Aug. 6, 1953, A. H. Smith 61350.

Pileus 2-6 mm broad, sessile, cuneate or spathulate, tawny, alutaceous, or dull cinnamon, glabrous, base sometimes pale tawny or whitish strigose, margin even, incurved then spreading. Context white or pallid; odor and taste mild.

Lamellae narrow, crowded or close, white or whitish then brownish.

Spores 4-5.5 A in diameter, globose to subovoid, punctate. Basidia 19-28 x 5-6 µ, 4-spored. Pleurocystidia none; cheilocystidia 22-48 x 4-11 µ, clavate, ventricose, at times capitate. Gill trama subparallel or slightly interwoven, hyphae 4-9 µ broad. Pileus trama interwoven, at times loosely so. Cuticle of repent hyphae, 4-8 layers thick, bearing scattered pileocystidia , which are colorless, clavate, or ventricose, 30-74 x 6-12 µ. Clamp connections present.

Habit, Habitat, and Distribution: On hardwood logs, Michigan, New Hampshire, and Maine, July-August.

Material Studied: MAINE: Bigelow 10571; MICHIGAN: Shaffer 2054 (MICH); Smith 61350 (type, from Carp Creek, near Pellston, Aug. 6, 1953), 66262; NEW HAMPSHIRE: Bigelow 11958 (MASS).

Observations: This is related to C. cuneiformis which has broad gills and larger spores.