The North American Species of Crepidotus
90. Crepidotus albidus E. & E., Philadelphia Acad. Nat. Sci. Proc. 1894: 322. 1895.
Illustration: Fig. 162.
Pileus 5-7.5 mm broad, sessile, resupinate, nearly white, glabrous, margin incurved when dry.
Lamellae radiating from a lateral point, pallid, becoming yellowish-brown, broad, not crowded, thin.
Spores 5-7 x 4-5 µ, ellipsoid, smooth. Basidia 27-31 x 5-6 µ, 4 -spored. Pleurocystidia none; cheilocystidia 25-35 x 2-5 µ, more or less filamentous to cylindric, somewhat flexuous. Pileus trama interwoven. Cuticle of repent hyphae, bearing more or less erect, slender, short hyphae. Clamp connections small and rare.
Habit, Habitat, and Distribution: On hardwood, Michigan and Colorado, April-May.
Material Studied: COLORADO: Bethel, collected at Palmer Lake, March 1911, marked "Type" (NY); MICHIGAN: Kauffman 95, on dead trees, Ann Arbor, collected by A. J. Pieters, May 23, 1894, and marked "Co-Type" by Kauffman; a portion of the type collection, presumably sent from Ann Arbor to Ellis by Pieters, is on deposit at N. Y. Botanical Garden, and another portion is at University of Michigan.
Observations: The material of both the Michigan and Colorado collections is sparse and not satisfactory for critical study. The description of the spores given above is based on the iso-type from Michigan. The description of gill and pileus structure above is based on the Bethel collection from Colorado, which is not the type, even though it is so marked. Although our study of this species is unsatisfactory, we include an account of it for the record and in the hope it may be found again. It is characterized by its small whitish, glabrous pileus, its short, smooth spores, and the presence of clamp connections.