The North American Species of Crepidotus

53. Crepidotus montanus sp. nov.

Illustrations: Figs. 112, 113.

Pileus 5-10 mm latus, sessilis, fabelliformis, fuscus, glabrosus, striatulatus. Lamellae confertae, medio-angustae, albae deinde brunneae. Sporae 5-7.5 µ, globosae vel ovoideae, punctatae. Basidia 23-27 x 5-6 µ, tetraspora. Pleurocystidia 27-38 x 5 -7 µ; cheilocystidia 28-45 x 5-10 µ. Cuticula ex hyphis repentibus composita, adsunt pileocystidia , 30-72 x 4-10 µ. Fibulatae adsunt. Specimen typicum in Herb. Univ. Tenn.; lectum in Great Smoky Mts. National Park, Tenn., July 26, 1936, L. R. Hesler 8934.

Pileus 5-10 mm broad, sessile, flabelliform, tawny, glabrous or appearing so, margin striatulate when wet.

Lamellae close, moderately narrow, white, finally brown, edges serrulate.

Spores 5-7.5 µ in diameter, globose or ovoid, punctate. Basidia 23-27 x 5-6 µ, 4-spored. Pleurocystidia 27-38 x 5-7 µ clavate, appendiculate; cheilocystidia 28-45 x 5-10 µ, clavate, ventricose, or somewhat flask-shaped. Gill trama undulating-subparallel to slightly interwoven, hyphae 4-7 µ broad. Pileus trama interwoven. Cuticle of repent hyphae, with scattered to numerous pileocystidia which are clavate, ventricose or fusoid, or at times subcapitate and measure 30-72 x 4-10 µ. Clamp connections present.

Habit, Habitat, and Distribution: On log, Tennessee, July.

Material Studied: TENNESSEE: Hesler 8934, type, along trail from Indian Gap to Chimneys, Great Smoky Mountains National Park, July 26, 1936.

Observations: This is rather close to C. roseus, differing chiefly in color, and also in the form of the pleurocystidia.