The North American Species of Crepidotus

69. Crepidotus rainierensis sp. nov.

Illustrations: Figs. 141, 142.

Pileus 5 cm latus, 2-3 cm longus, sessilis, flabelliformis, "cinnamon buff," fibrillosus demum squamulosus. Lamellae "cinnamon buff" angustae, subdistantes. Sporae 7-9 (10) x 3-4.5 µ, elongatae, subpyriformes, punctatae. Basidia 23-26 x 6-7.5 µ, tetraspora. Pleurocystidia 25-35 x 6-10 µ; cheilocystidia 33-47 x 5-7 µ. Cuticula hyphas brunneas incrustatas et non-incrustatas sine colore gerens, 4-6 µ latas. Fibulae adsunt. Specimen typicum in Herb. Univ. Mich.; lectum in Mt. Rainier National Park, Washington, Sept. 24, 1952, A. H. Smith 40178.

Pileus 5 cm wide, 2-3 cm long, sessile, broadly fan-shaped, "cinnamon buff," evenly fibrillose to appressed squamulose.

Lamellae radiating, dingy cinnamon, drying russet to dark cinnamon, subdistant, narrow. Spores 7-9 (10) x 3-4.5 µ, elongated drop-shaped, inequilateral in profile, obscurely roughened-punctate, ochraceous in 2% KOH. Basidia 23-26 x 6-7.5 µ, 4-spored. Pleurocystidia 25-35 x 6-10 µ, cylindric-capitate, clavate, or obclavate, inconspicuous, with a highly refractive granulose content in 2% KOH; cheilocystidia 33-47 x 5-7 µ, cylindric, or clavate-fusoid, at times appendiculate, with a granulose refractive content. Gill trama subparallel, hyphae 5-8 µ broad. Pileus trama more or less interwoven. Cuticle bearing a dense turf of brown, incrusted hyphae, 9-12 µ broad, and some colorless, non-incrusted hyphae, 4-6 µ broad. Clamp connections present.

Habit, Habitat, and Distribution: On conifer log, Washington, September.

Material Studied: WASHINGTON: Smith 40178, type, from Mt. Rainier National Park, St. Andrews Creek, Sept. 24, 1952.

Observations: This species is distinguished from its near relatives by its pileus colors, elongated drop-shaped or long-pyriform spores, incrusted cuticular hyphae, and the presence of pleurocystidia