The North American Species of Pholiota

167. Pholiota scamboides sp. nov.

Pileus 1-2.5(3) cm latus, obtusus, glutinosus, argillaceus. Lamellae pallidae demum pallide luteae, confertae, latae, adnatae. Stipes 1-2.5 cm longus, 2-2.5 mm crassus. Vellum sparsum, pallidum. Sporae 7-10.5 x 4-5.5 µ. Pleurocystidia 36-55 x 9-16 µ. Specimen typicum in Herb. Univ. Mich. conservatum est; legit prope Priest Lake, Idaho Oct. 5, 1964. Smith 71058.

Pileus 1-2.5 (3) cm broad, obtusely conic with a curved in margin, glabrous, slimy viscid, color whitish-buff to finally pinkish buff, when dried slightly darker on the disc than margin, the latter about pinkish buff; veil leaving only a few traces as fibrils on the pileus margin. Context pliant, pallid, odor and taste not distinctive, KOH, no reaction, FeSO4 no reaction.

Lamellae yellowish white (pale ivory yellowish), becoming dingy clay-color close, broad, adnate, when dried dingy yellow-brown.

Stipe 1-2.5 cm long, 2-2.5 mm thick, equal coated to the gills with fine soft ivory yellowish fibrils (which are not part of the veil), color beneath the surface fibrils pinkish buff to cinnamon buff, finally clay color in basal part; veil pallid and very rudimentary (observable only on very small buttons).

Spores 7-10.5 x 4-5.5 µ, smooth, apical pore minute; shape in face view ovate to subelliptic, in profile elliptic to obscurely inequilateral; color in KOH tawny, in Melzer's reagent slightly more cinnamon but paler; wall about 0.3 µ thick.

Basidia 22-30 x 7-8.5 µ, 4-spored (rarely 2-spored), clavate, hyaline to ochraceous in KOH. Pleurocystidia abundant, 36-48 (55) x 9-16 µ, fusoid-ventricose with obtuse apex, smooth or with incrustations variously distributed, walls thin, content yellowish in KOH but not coagulated into a distinct body as revived in KOH, neck often rather short. Cheilocystidia similar to pleurocystidia. Caulocystidia more or less similar to pleurocystidia but usually the neck not as well differentiated varying more to clavate, often with yellow (in KOH) incrusting material on the upper part.

Gill trama with a central area of regularly arranged hyphae of narrow (4-7 µ) greatly elongated cells, inflating in age; walls thin, smooth and hyaline; subhymenium a gelatinous layer of narrow (3-4 µ) diverging hyaline hyphae. Pileus cutis a thick gelatinous pellicle of hyphae 2.5-4.5 µ diam., many with ochraceous incrustations on the wall; hypodermium a rusty brown (in KOH) layer of non-gelatinous hyphae with smooth or incrusted walls. Context hyphae compactly arranged, hyaline, thin-walled, cells inflating by maturity, oleiferous hyphae present. Clamp connections present.

Habit, Habitat, and Distribution:Gregarious on wet sand (apparently from buried wood) Mosquito Bay, Priest Lake, Idaho. Oct. 5, 1964. Smith 71058, type.

Observations: This species is obviously a segregate of P. scamba but excellent specimens of all stages were present and it differs in the truly slimy pileus and very reduced veil. The pleurocystidia especially when young remind one of chrysocystidia in being clavate-mucronate but by maturity a distinct neck develops and they are fusoid ventricose. They lack the content characteristic of chrysocystidia when revived in KOH.