The North American Species of Crepidotus

80. Crepidotus fusisporus var. rameus var. nov.

Illustrations: Figs. 22, 153, 154.

Pileus (3) 10-30 mm latus,flabelliformis, ungulatus vel conchatus, albus, pubescens, margine incurvatus, lobatus. Lamellae albae deinde "pinkish buff," denique "clay color," confertae medio-latae. Sporae 7-9 (10) x (3) 4-5 (5.5) µ, fusoideae, asperae vel paene planae. Pleurocystidia desunt; cheilocystidia 21-43 (72) x 5-15 µ contortae. Cuticula hyphas erectas, rectas vel sinuosas demum in spiram volutas gerens. Fibulae adsunt. Specimen typicum in Herb. Univ. Mich.; lectum in Tahquamenon Falls State Park, Mich., Aug. 7, 1963, A. H. Smith 67058.

Pileus (3) 10-30 mm broad, flabelliform, ungulate or conchate, surface snow white, cottony pubescent, becoming dingy yellowish in KOH, FeSO4 -0, margin often creased to lobed, incurved at first. Context thin and pliant, white, odor and taste mild.

Lamellae close to near subdistant, moderately broad, white becoming pinkish buff, finally clay color, edges even, attached around the base of the pseudostipe.

Stipe a white pseudostipe, or more rarely a true, eccentric stipe, 1 x 0.2-0.3 mm.

Spore deposit pinkish cinnamon-buff. Spores 7-9 (10) x (3) 4-5 (5.5) µ, fusoid, nearly smooth or obscurely rough, often in clumps of 2, 3, or 4. Pleurocystidia none; cheilocystidia 21-43 (72) x 5-15 µ, ventricose, subfusoid, occasionally with a neck, at times forked, contorted or asymmetrical, knobbed. Gill trama interwoven, hyphae 2-3 µ, or 5-8 µ broad. Epicuticular hyphae straight or, especially on the margin, crooked or coiled. Clamp connections present.

Habit, Habitat, and Distribution: On fallen twigs of Betula, Alnus, and other hardwoods, Maine and Michigan, June-August.

Material Studied: MAINE: Bigelow 3040, 3085, 3168, 4035 (MASS); MICHIGAN: Smith 32601, 49866, 50036, 66645, 67057, 67058 (type, from Tahquamenon Falls State Park, Aug. 7, 1963), 67059, 67223; Thiers 3155 (MICH).

Observations: This variety differs from others in its crooked to coiled, epicuticular hyphae and its contorted cheilocystidia.