The North American Species of Crepidotus

60. Crepidotus subaureifolius sp. nov.

Illustrations: Figs. 125, 126.

Pileus 1-6 cm latus, sessilis, suborbicularis, reniformis vel dimidiatus, brunnaceo-fibrillosus, subflavo-ochreus demum fulvo-ochraceus, striatus. Lamellae primum aurantiae deinde ochraceo-coriaceae, confertae, latae vel medio-latae. Sporae 4.5 -6.5 (7) µ, globosae, punctatae. Basidia (20) 24-34 x (6) 7-9 µ, tetraspora. Pleurocystidia 20-40 x (7) 9-15 µ; cheilocystidia 23-48 x 4-10 µ. Cuticula ex hyphis repentibus composita, hyphas incrustatas brunneas et sine colore gerens. Fibulatae  adsunt. Specimen typicum in Herb. Univ. Mich.; lectum in Tahquamenon Falls State Park, Mich., Aug. 11, 1955, Beach 28.

Pileus 1-6 cm broad, sessile, suborbicular, reniform, or dimidiate, finally more or less expanded, hygrophanous, densely brownish-fibrillose at base, thinly so toward the margin, yellowish ocher to ochraceous tawny fading to ochraceous-buff, margin striate. Context firm, white to pallid; odor and taste mild or none.

Lamellae at first orange, finally ochraceous-buff, close, broad or medium broad.

Spores "snuff brown" in deposits, 4.5-6.5 (7)µ in diameter, globose, punctate, wall medium thick. Basidia (20) 24-34 x (6) 7-9 µ, 4-spored. Pleurocystidia 20-40 x (7) 9-15 µ, clavate, spathulate, subpyriform, napiform, or flask-shaped with a neck; cheilocystidia 23-48 x 4-10 µ, clavate, more or less constricted, at times subcylindric. Gill trama subparallel, hyphae 5-9 µ broad. Pileus trama interwoven. Cuticle of repent hyphae, bearing both brown, incrusted, and colorless hyphae. Clamp connections present.

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

Material Studied: MICHIGAN: Beach 28 (MICH), type, from Tahquamenon Falls State Park, August 11, 1955; Smith 66273.

Observations: The presence of broad pleurocystidia excludes it from C. crocophyllus and aureifolius.