The North American Species of Crepidotus

22. Crepidotus subapplanatus sp. nov.

Illustrations: Figs. 65, 66, 67, 68, 69.

Pileus 8-25 mm latus, sessilis,flabelliformis demum subcuneatus, glabrosus, albus. Lamellae angustae, confertae, albae demum pallido-cinnamomeae. Sporae 4-5.5 µ, globosae, punctatae. Basidia 20-24 x 5-6 µ, di- et tetraspora. Pleurocystidia 24-36 x 5-6 µ; cheilocystidia 17-35 x 4-11 µ. Cuticula ex hyphis repentibus composita, cum pilocystidiis, 30-67 x 4-8 µ. Fibulae adsunt. Specimen typicum in Herb. Univ. Mich.; lectum in Tahquamenon Falls State Park, Michigan, July 15, 1959, A. H. Smith 61101.

Pileus 8-25 mm broad, flabelliform to subcuneate, glabrous, at times villose toward the base, white, sessile, laterally attached, the pileus at times prolongated into a pseudostipe.

Lamellae radiating from the base or lateral pseudostipe, narrow, close, white then pale cinnamon, edges fimbriate.

Spores 4-5.5 µ, globose, punctate.

Basidia 20-24 x 5-6 µ, 2-4-spored. Pleurocystidia 24-36 x 5-6 µ, more or less cylindric to slender-ventricose, with a slender neck (appendiculate); cheilocystidia 17-35 x 4-11 µ, versiform: clavate and more or less capitate, ventricose, more rarely crooked or forked. Gill trama subparallel, hyphae 4-7 µ broad. Pileus trama interwoven. Cuticle of repent hyphae, with scattered pileocystidia , cylindric, clavate, or ventricose to bottle-shaped, 30-67 x 4-8 µ. Clamp connections present.

Habit, Habitat, and Distribution: On hardwood, Michigan and New Hampshire, July.

Material Studied: MICHIGAN: Smith 61101, type, from Tahquamenon Falls State Park, July 15, 1959; NEW HAMPSHIRE: Bigelow 12017 (MASS); NORTH CAROLINA: Hesler 23088, Blue Ridge Parkway, Tanbark Tunnel, July 30, 1958.

Observations: Except for pleurocystidia, this is close to C. applanatus.