The North American Species of Crepidotus

12. Crepidotus sububer sp. nov.

Pileus 3-5 mm latus, sessilis, superficie brunneo fibrillosus vel tomentosus, margine villosus, incurvatus. Lamellae angustae demum medio-latae, paene subdistantes, pallidae, marginibus gelatinosae. Sporae (6) 7-9.5 x 4.5-6 (7) µ, ellipsoideae, planae. Pleurocystidia absunt; cheilocystidia 36-86 x 5-8 µ, gelatinosa. Pilei trama intertexta, pars exterior gelatinosa, superficies gerens densum caespitem e brunneis incrustatis hyphis compositum. Fibulae desunt. Specimen typicum in Herb. Univ. Mich.; lectum prope Priest Lake, Idaho, Oct. 22, 1956, A. H. Smith 55309.

Pileus 3-5 mm broad, sessile, densely brown-fibrillose or tomentose, margin villose, incurved.

Lamellae narrow to medium broad, nearly subdistant, pallid, edges gelatinous.

Spores (6) 7-9.5 x 4.5-6 (7) µ, ellipsoid, smooth. Basidia 27-33 x 6 -7 (9) µ, 2-4-spored. Pleurocystidia none; cheilocystidia tramal, 36-86 x 5-8 µ, gelatinous, filamentous, often enlarged below or near middle, and then slender bottle-shaped or ventricose. Gill trama of slender (3-5 µ), subparallel hyphae of long cells. Pileus trama interwoven, the outer zone more or less gelatinous, but not differentiated into a distinct cuticular zone as in C. mollis, the surface bearing a dense turf of brown, incrusted hyphae, 7-15 µ broad. Clamp connections none.

Habit, Habitat, and Distribution: On Populus, Idaho, October.

Material Studied: IDAHO: Smith 55309, type, from Priest Lake, Oct. 22, 1956.

Observations: As in C. uber, a gelatinous surface is not differentiated. The very densely fibrillose or tomentose surface of the pileus, however, distinguishes it from C. uber.