The North American Species of Pholiota

75. Pholiota subochracea (Smith) comb. nov.

Hypholoma subochraceum Smith, Mycologia 36: 250. 1944.
Naematoloma subochraceum (Smith) Smith, Mycologia 38: 502. 1946.

Illustrations: Text figs. 92-93; pls. 31, 32, 86b.

Pileus 2-4 cm broad, convex with an inrolled margin and becoming broadly convex to plane, surface glabrous except for scattered fibrillose flecks along the margin from the broken veil, glutinous when wet, under a lens appearing somewhat appressed-fibrillose beneath the gluten, very pale ochraceous tawny on the disc, pale yellow ("massicot-yellow") over marginal area, when old more or less cinnamon-buff over all. Context thin, firm, equal, yellowish, unchanging, odor none, taste mild.

Lamellae close, about 35 reach the stipe, 2-3 tiers of lamellulae, equal, narrow to moderately broad, adnate becoming depressed-adnate, pale yellow ("marguerite-yellow") when young, dingy cinnamon when mature, edges even.

Stipe 5-9 cm long, 5-7 mm thick at apex, equal or slightly enlarged downward, tubular to hollow, surface over lower portion pale yellowish white from a thin coating of white fibrils extending to an evanescent zone left by broken veil, yellowish beneath the fibrils, apex yellow and silky, on aging becoming rusty brown from base upward and glabrescent.

Spore deposit yellow-brown ("snuff-brown"); spores 5-6 x 2.5-3 µ, smooth, elliptic to oblong in face view, in profile subelliptic to slightly bean-shaped; color pale ochraceous in KOH and Melzer's reagent; wall thin, apex blunt but not truncate, no apical pore visible.

Basidia 4-spored, 16-18 x 4-5 µ, yellowish in KOH. Pleurocystidia 32-47 x 10-15 µ, clavate-mucronate to fusoid-ventricose, as revived in KOH with a highly refractive central body. Cheilocystidia mostly chrysocystidia (like the pleurocystidia) but a few basidiole-like leptocystidia present also.

Gill trama subparallel, hyphae non-gelatinous, walls yellowish to brownish revived in KOH; subhymenium scarcely distinct. Pileus epicutis a layer of appressed subgelatinous narrow (2-4 µ) yellowish hyphae with smooth to faintly asperulate walls; hypodermium of inflated rusty ochraceous hyphae. Clamp connections present. All hyphae inamyloid.

Habit, Habitat, and Distribution: Caespitose to gregarious on decaying conifer logs, Pacific Northwest, in the fall, often late.

Observations: This species, like P. astragalina, is difficult to dry. It discolors badly if even slightly overheated. The pale ochraceous viscid pileus, numerous chrysocystidia and the fact that the spores are not truncate characterize it.

Material Examined: IDAHO: Smith 73687, 74081. OREGON: Smith 19733, 19684, 19811, 19812, 19940, 20149, 20189, 24346. 24636, 24737, 24969, 27727, 27868, 26974, 28333. WASHINGTON: Smith 31573, 31681, 31766, 41178.