The North American Species of Pholiota
129. Pholiota sequoiae sp. nov.
Illustrations: Text figs. 474-476.
Pileus 4-7 cm latus, conicus demum conico-umbonatus, glutinosus, squamulosus, (squamis superficialibus), ad centum obsure fulvus, ad marginem pallidus. Contextus pallide luteus. Lamellae latae, adnatae confertae, subdecurrentes, pallide vel pallide luteae, demum avellaneae vel lignobrunneae. Stipes 6-8 cm longus, 6-9 mm crassus, subcartilageneus, intus luteus, ad apicam furfuraceo-sericeus et albidus, deorsum fulvus. Sporae (6) 7-8(9) x 4.5 (5) µ. Pleurocystidia anguste fusoide ventricosa, 40-80 x 9-15 µ; subcrassotunicata (0.4-1 µ). Specimen typicum in Herb. Univ. Mich. conservatum est; legit prope Orick, Calif., Dec. 5, 1935. Smith 3789.
Pileus 4-7 cm broad, conic-campanulate to expanded and with a sharp conic umbo, glutinous when young and in age with patches of brownish gluten along the margin, extreme edge with fibrillose squamules from the broken veil, disc at first covered by appressed, buff colored fibrillose squamules, glabrous in age, "russett" to "cinnamon-brown" on the disc (rusty brown to pale fulvous) near "ochraceous-tawny" toward the whitish margin; flesh thick in the disc, tapering evenly, pale watery yellow, rather tough, odor and taste not distinctive.
Lamellae close, moderately broad (6-7 mm), equal, adnate, with a slight decurrent tooth, whitish to pale yellow becoming avellaneous to wood-brown.
Stipe 6-8 cm long, 6-9 mm equal, hollow, fairly tough, yellowish within, apex fibrillose-scurfy, below the faint fibrillose zone fibrillose with yellowish appressed fibrils, whitish above, base becoming dingy rusty brown.
Spores (6) 7-8 (9) x 4-4.5 (5) µ, smooth, apical pore very minute, shape elliptic to subovate in face view, in profile elliptic to obscurely inequilateral, rusty cinnamon to more ochraceous tawny in KOH, in Melzer's more ochraceous, wall moderately thick (about 0.3 µ).
Basidia 18-24 x 5-8 µ, rather obese to clavate, 4-spored, yellowish in Melzer's reagent, hyaline to yellowish in KOH. Pleurocystidia abundant, 40-80 x 9-15 µ, subcylindric to narrowly fusoid-ventricose, apex obtuse to capitate, smooth, wall slightly thickened (0.4-1 µ), content ochraceous in KOH at least in neck but leaching out on standing, walls hyaline to yellowish-hyaline in KOH and Melzer's, at times with refractive particles in neck near apex. Cheilocystidia similar to pleurocystidia but smaller and varying to subfusoid, walls often thinner and apex merely obtuse. Caulocystidia none.
Gill trama a central area of floccose subparallel hyphae flanked on either side by a gelatinous subhymenial layer of narrow (2 µ ±) branched hyphae. Pileus cutis a thick gelatinous layer of narrow (3-5 µ) pale ochraceous (in KOH) hyphae some having encrusting material, loosely arranged in the matrix of slime; hypodermial region of broader 4-10 u hyphae rusty-brown in KOH and incrusted. Context hyphae smooth, thin-walled, interwoven, cells inflated to 15 µ +, walls ochraceous to hyaline. All hyphae inamyloid. Clamp connections present.
Habit, Habitat, and Distribution: Gregarious on redwood sticks and debris, Orick, Calif. Dec. 5, 1935. Smith 3789, type.
Observations: The outstanding features of this species are the glutinous pileus with superficial squamules of veil remnants at first, the rusty-brown disc and whitish pileus margin, pale watery yellow flesh, whitish to pale yellow gills when young, whitish stipe apex and stipe base becoming rusty brown, the large pleurocystidia with slightly thickened walls, and medium sized spores. It is close to P. agglutinata especially in colors and cystidial features but the latter has spores 5.5-6.5 (7) x 3.5-4 µ and grew on a mossy bank.