The North American Species of Pholiota

127. Pholiota subminor sp. nov.

Illustrations: Text figs. 504-505; 507.

Pileus 2-3 cm latus, convexus, viscidus, glaber, ad centrum vinaceobrunneus, ad marginem subluteus; contextus subluteus, sapor mitis, inodorus; lamellae confertae latae, adnatae, luteolae demum subfulvae; stipes 2-3 cm longus, 2-3.5 mm crassus, sursum subluteus, deorsum sordide brunneus; sporae 7-9 x 5-6 µ, leves, ovatae; pleurocystidia 55-80 x 9-15 µ fusoide ventricosa, saepe crassotunicata. Specimen typicum in Herb. Univ. Mich. conservatum est; legit in querci, Oregon Caves Road, prope Cave Junction, Ore., 1 Dec. 1937. Smith 9294.

Pileus 2-3 cm broad, convex expanding to plane, surface slimy viscid (slime layer thin), glabrous, on the disc dingy to bright vinaceous brown, more yellowish to the margin (pallid in sporulating basidiocarps, sulphur yellow in sterile ones). Context pallid to yellowish, odor and taste not distinctive.

Lamellae close, broad adnate, yellowish becoming dingy ochraceous tawny but sulphur yellow in sterile caps, edges even.

Stipe 2-3 cm long, 2-3.5 mm thick, yellowish above veil line, soon dingy yellowish-brown below, brighter yellow if gills were sterile, veil yellowish, cortinate, leaving an apical evanescent zone.

Spores 7-9 x 5-6 µ, smooth, apical pore distinct but apex not truncate; shape in face view ovate to elliptic; in profile mostly subelliptic, color in KOH rather bright ochraceous tawny, in Melzer's reagent about the same; wall about 0.25 µ thick.

Basidia 4-spored, 17-20 x 6.5-8 µ, subclavate, many ochraceous in KOH (content colored). Pleurocystidia 55-80 x 9-15 µ, fusoid ventricose, the neck with walls up to 1.5 µ + thick in some, apex 4-6 µ broad, obtuse, content coagulated and ochraceous in KOH, or hyaline and homogeneous, smooth; cheilocystidia similar to pleurocystidia and with thinner walls (± 0.5 µ thick). Caulocystidia present only near stipe apex and similar to cheilocystidia.

Gill trama of subparallel hyphae with cells inflated to 10-20 µ, walls thin and smooth, yellow to hyaline in KOH; subhymenium a gelatinous zone of branched narrow hyphae. Pileus cutis a gelatinous pellicle of loosely arranged yellowish hyphae with disintegrating walls in KOH, hyphae 2-4.5 µ diam., hypodermium of interwoven non-gelatinous hyphae with ochraceous incrusted walls, the cells inflated to 15 µ (±). Context hyphae interwoven, smooth, yellow in KOH, cells inflated. Clamp connections present.

Habit, Habitat, and Distribution: Gregarious on an oak log, near Oregon Caves, Ore. Dec. 1, 1937. Smith 9294, type.

Observations: In its wide spores, broad gills, coloration and yellow veil the species is close to P. pulchella especially var. brevipes, but is readily distinct by its thick walled pleurocystidia, and habitat on oak. It was mistaken at first for P. velaglutinosa with "reduced" veil and filed as a variant of that species. The spores, habitat and lack of a gelatinous veil readily distinguish it.