The North American Species of Crepidotus

7. Crepidotus ochraceus sp. nov.

Illustration: Fig. 40.

Pileus 3 cm latus, sessilis, flabelliformis, subluteo-brunneus vel ochraceus ("Isabella color" vel "snuff brown"), glaber, gelatinosus, margine striatus. Lamellae subdistantes demum confertae, latae, marginibus gelatinosae. Sporae 8-10 x 5.5-7 µ, ellipsoideae, planae. Basidia 24-30 x 6-8 µ, di- vel tetraspora. Pleurocystidia desunt; cheilocystidia 23-45 x 3-6 µ. Cuticula gelatinosa. Fibulae desunt. Specimen typicum in Herb. Univ. Mich.; lectum in Mt. Hood National Forest, Oregon, Nov. 4, 1947, A. H. Smith 28494.

Pileus 3 cm broad, sessile, flabelliform, ochraceous, dull yellow brown or olivaceous ("Isabella color" or "snuff brown"), gelatinous, glabrous, margin striate.

Lamellae broad, subdistant, nearly close, edges gelatinous.

Spores 8-10 x 5.5-7 µ, ellipsoid, smooth, wall thick, brown, with a "plug," slightly inequilateral in profile view.

Basidia 24-30 x 6-8 µ, 2-4 -spored. Pleurocystidia none; cheilocystidia 23-45 x 3-6 µ, filamentous, clavate or somewhat bottle-shaped with a neck, occasionally septate, at times brownish. Gill trama of narrow (2.5-5 µ), loosely interwoven, irregularly branched hyphae. Subhymenium a narrow zone of parallel, slender (2-4 µ) hyphae. Pileus trama of branched, interwoven, very loosely arranged hyphae. Cuticle of loosely interwoven, slender (2.5-4 µ), gelatinous hyphae forming a gelatinous zone 250-375 µ thick. No epicuticular hyphae surmounting this zone. Clamp connections none.

Habit, Habitat, and Distribution: On Alnus, Oregon, November.

Material Studied: OREGON: Smith 28494, type, from Still Creek, Mt. Hood National Forest, Nov. 4, 1947.

Observations: The ochraceous, glabrous pileus, distinct gelatinous cuticular zone, and the lack of any- specialized epicuticular hyphae distinguish this species. It is near C. alabamensis, which has smaller spores and a turf of colorless epicuticular hyphae.