The North American Species of Crepidotus

46. Crepidotus sublatifolius sp. nov.

Illustrations: Figs. 11, 102, 103.

Pileus (1.5)8-15 mm latus, sessilis, ungulatus vel conchatus demum flabelliformis, "pinkish buff" demum cinnamomo-coriaceus vel pallido-melleus ut mel, albus pubescens, striatus. Lamellae albae deinde obscuro-flavidae, denique paene "buckthorn brown," confertae demum paene subdistantes, medio-angustae demum latae. Sporae 4.5-6 µ globosae demum ovoideae, punctatae. Basidia 20-28 x 4-6 (7) µ, di- et tetraspora. Pleurocystidia 20-34 x 5-8 µ; cheilocystidia 27-64 (80) x 5-9 (12) µ. Cuticula ex hyphis repentibus composita, hyphas erectas et pileocystidia gerens. Fibulae adsunt. Specimen typicum in Herb. Univ. Mich.; lectum prope Emerson, Mich., Aug. 12, 1963, A. H. Smith 67117.

Pileus (1.5) 8-15 mm broad, sessile, ungulate, or conchate to flabelliform, "pinkish buff" to "cinnamon buff," or pale honey-yellow, white pubescent or villose, hygrophanous, margin striate when fresh. Context fragile, thin; odor and taste mild or none.

Lamellae at first whitish to dull yellowish, near "buckthorn brown" at maturity, close to nearly subdistant, medium narrow to broad, edges even or crenulate.

Spores 4.5-6 µ, in diameter, globose or more or less ovoid, punctate, at times obscurely so, yellowish-brown in KOH. Basidia 20-28 x 4-6 (7) µ, 2 -4-spored. Pleurocystidia 20-34 x 5-8 µ, clavate or bottle-shaped with a neck, or ninepin-shaped; cheilocystidia 27-64 (80) x 5-9 (12) µ, cylindric, ventricose, at times flexuose, capitate. Gill trama subparallel or more or less interwoven, hyphae 4-11 µ broad. Pileus trama interwoven. Cuticle of repent hyphae, bearing a turf of erect hyphae, the terminal elements often as pileocystidia . Clamp connections present.

Habit, Habitat, and Distribution: On hardwood logs and slashings, Michigan, July-October.

Material Studied: MICHIGAN: Lange 1182 (MICH); Smith 32396, 32599, 67117 (type, from Emerson, Aug. 12, 1963), 67132.

Observations: The pileus colors, white pubescence, and the pleurocystidia are distinctive characters.