The North American Species of Crepidotus

115. Crepidotus subverrucisporus var. roseifolius var. nov.

Illustrations: Figs. 30, 188.

Pileus 5-45 mm latus, ungulatus demum dimidiatus, primum albus deinde obscurus, pubescens demum albo-fibrillosus. Lamellae albae deinde roseae denique cinnamomeae, angustae, subdistantes. Sporae 7-9 (10) x 4.5-5.5 (6) µ ellipsoideae, rugoso-verrucosae, "sayal brown." Basidia 27-33 x 6-8 µ, tetraspora. Pleurocystidia desunt; cheilocystidia 25-45 (60) x 3-8 µ. Cuticula ex hyphis repentibus composita, hyphas erectas sine colore gerens, 2-3 (4-9) µ latas. Fibulae adsunt. Specimen typicum in Herb. Univ. Mich.; lectum prope Pellston Hills, Mich., Oct. 7, 1955, A. H. Smith 50875.

Pileus 5-45 mm broad, ungulate to dimidiate, white or whitish at first, becoming somewhat dingy in age, pubescent to white cottony fibrillose, margin at times crenate. Context thin, white; odor and taste not distinctive.

Lamellae white becoming pinkish, finally cinnamon, narrow, becoming medium broad especially near point of attachment, subdistant, attached to a pseudostipe, or merely arising from a basal point.

Stipe none, or only as a temporary pseudostipe.

Spores 7-9 (10) x 4.5-5.5 (6) µ, ellipsoid to ovoid in face view, slightly inequilateral in profile, wrinkled-verrucose, "sayal brown" in deposit. Basidia 27-33 x 6-8 µ, 4-spored. Pleurocystidia none; cheilocystidia 25-45 (60) x 3-8 µ, filamentous, clavate, cylindric, or ventricose. Gill trama subparallel to slightly interwoven, hyphae 4-7 (10) µ broad. Pileus trama interwoven. Cuticle of repent hyphae, bearing a turf of colorless hyphae 2-3 µ or some broader (up to 4-9 µ). Clamp connections present.

Habit, Habitat, and Distribution: On hardwood sticks and branches, Michigan, Colorado, Utah, and Oregon, June-November.

Material Studied: COLORADO: Smith 52852, 52860, 52910; MICHIGAN: Thiers 2950 (MICH); Smith 36848, 50875 (type, from Pellston Hills, Oct. 7, 1955), 50885, 60919, 61027, 63568, 63570a, 66984; OREGON: Smith 28588; UTAH: McKnight F106 (MICH).

Observations: The distinctive character of this variety is its pink gills. The cheilocystidia are usually shorter than in the type variety; otherwise var. roseifolius is similar to var. subverrucisporus.