The North American Species of Pholiota
62. Pholiota albivelata Murrill, Mycologia 4: 260. 1912.
Pileus (2) 4-8 cm broad, broadly convex when young, expanding to broadly convex, or slightly umbonate, or plane, pale vinaceous brown to dark vinaceous brown ("army-brown" to "fawn-color"), the margin paler, the umbo slightly darker, viscid, smooth or somewhat papillate to rugulose from wrinkling of the pellicle, glabrous. Context thick on the disc, gradually thinner to the margin, white or whitish, soft and pliant; odor fungoid, taste mild.
Lamellae bluntly adnate, with a decurrent tooth, or slightly depressed around the stipe, white, becoming dark avellaneous ("wood-brown"), close or nearly so, moderately broad, edges white-crenate.
Stipe 5-10 cm long, 4-10 mm thick, white and appressed-fibrillose or floccose above the annulus, the lower portion discolored, or more rarely yellowish, conspicuously scurfy below the annulus but the base nearly glabrous, equal, hollow, usually the base with numerous white rhizomorphs. Veil forming a more or less median, broad, membranous, white, persistent annulus, which is striate on the upper surface and white floccose on the lower surface.
Spores "cinnamon-brown" in deposit (dark yellow-brown); 7-9 x 4-5.5 µ, elliptic to ovate in face view, in profile subelliptic to obscurely inequilateral, germ pore very minute (apex not truncate), in KOH dull cinnamon, in Melzer's reagent about the same. Basidia 25-32 x 6-8 µ, 4-spored, clavate, hyaline in KOH, yellowish in Melzer's reagent. Pleurocystidia abundant, 30-50 (60) x 5-12 µ, clavate to mucronate, wall thin, smooth, and hyaline, content as revived in KOH coagulated into a refractive amorphous mass usually resting in upper third of cystidium, in Melzer's reagent this mass ochraceous to orange-brown to dull red. Cheilocystidia 20-56 x 3-7 µ, filamentose-subcapitate, pedicel flexuous, smooth, thin-walled, content homogeneous. Caulocystidia scattered to rare resembling cheilocystidia.
Gill trama parallel to somewhat interwoven, hyphae with smooth hyaline thin walls (revived in KOH), cells short to elongated and in age inflated; subhymenium cellular and narrow but in KOH subgelatinous. Pileus epicutis a thick (100 µ ±) gelatinous layer of hyphae 1.5-3 µ diam. hyaline and smooth in KOH, interwoven; hymenopodium not differentiated structurally or by color or at most the hyphal cells in the region slightly more inflated. Context hyphae hyaline in KOH, floccose, with thin smooth walls, cells inflated in age. Clamp connections present. All hyphae non-amyloid.
Habit, Habitat, and Distribution: Solitary to scattered on debris, under conifers, Washington, Oregon and California, during the fall.
Observations: This species is closely related to P. sipei; for further comment see that species.
Material Examined: CALIFORNIA: Smith 3625, 3911, 3914, 3943, 8235, 8372, 9383, 9444, 9476, 56087, 56543, 56913; OREGON: Gruber 14-4; Sipe 135; Smith 20122, 20239, 24540, 24642, 24692, 24738, 24872, 27336; 13651, 13717, 13949, 14436, 14793, 16220, 17369, 17542. WASHINGTON: Imshaug 1086; Murrill 593 (type); Smith 13512.