The North American Species of Crepidotus

54. Crepidotus varicolor sp. nov.

Illustration: Fig. 114.

Pileus 2-5 cm latus, sessilis, suborbicularis, reniformis vel dimidiatus, glabrosus, albus pallido colore maculatus, "warm-buff' posteriore, margine "light drab," demum pallido-coriaceus vel cinnamomeo-brunneus, striatulatus. Lamellae primum cinereae, deinde cinnamomeae vel cinnamomeo-coriaceae, confertae, medio-latae demum latae. Sporae 5.4-7 (8) µ, globosae, punctatae. Basidia 28-32 x 6-7.5 µ, tetraspora. Pleurocystidia desunt; cheilocystidia 32-38 x 6.5-7 µ. Cuticula ex hyphis repentibus composita. Fibulae adsunt. Specimen typicum in Herb. Univ. Mich.; lectum in Tahquamenon Falls State Park, Mich., Aug. 4, 1955, Beach 29.

Pileus 2-5 cm broad, sessile, suborbicular, reniform, or dimidiate, hygrophanous, glabrous, white with pallid spots, and, at the point of attachment, with warm buff tints, marginal portion light drab to pale buff or cinnamon brown, finely striatulate.

Lamellae at first gray, finally becoming cinnamon to cinnamon buff, close, medium broad to broad.

Spores 5.4-7 (8) µ in diameter, globose, punctate. Basidia 28-32 x 6 -7.5 µ, 4-spored. Pleurocystidia none; cheilocystidia 27-38 x 4-8 µ, clavate. Gill trama parallel to slightly interwoven. Pileus trama interwoven. Cuticle of repent, radially-disposed hyphae. Clamp connections present.

Habit, Habitat, and Distribution: On wood, Michigan, August.

Material Studied: MICHIGAN: Beach 29 (MICH), type, from Tahquamenon Falls State Park, August 4, 1955.

Observations: This differs from C. malachius var. malachius in its peculiarly colored pileus, gray gills, and smaller cheilocystidia.