The North American Species of Pholiota

5. Pholiota subangularis nom. nov.

Kuehneromyces carbonicola Smith, Sydowia Suppl. 1: 53. 1957.
(non Pholiota carbonicola Singer, 1963)

Illustrations: Text figs. 175-176; pls. 1a, 1b.

Pileus 1-3 (4) cm broad, broadly convex with an incurved margin, expanding to plane or nearly so, "natal-brown" at first but gradually becoming paler (to "warm-sepia"), hygrophanous, fading to a bright or a dingy tawny, lubricous, glabrous or with a faint marginal zone of pallid fibrils from the thin veil. Context fragile, watery brown fading to buff; odor and taste none.

Lamellae adnate, seceding at times, more or less ochraceous tawny (paler when young, darker in age), broad, edges somewhat fimbriate.

Stipe 3-5 cm long, 2.5-3.5 mm thick, lower three-fourths silky from the remnants of a thin veil and at first with a superior fibrillose zone where the veil breaks, apex naked and shining, watery brown above, darker brown below and becoming bister from the base upward in age.

Spores 8-11.5 x 6-6.5 x 7-9 µ, elliptic in profile view, angular-ovate in face view varying to ovate or to kite-shaped, smooth in KOH, with a thick wall for the genus (0.5-1.8 µ), rich reddish cinnamon in KOH and in Melzer's, apical pore present and apex more or less truncate, pore 1-1.5 µ wide.

Basidia 23-26 x 8-10(11) µ, clavate, hyaline in KOH. Pleurocystidia none. Cheilocystidia 20-26 x 8-13 µ, abundant but readily collapsing and not easily demonstrated on old gills, fusoid-ventricose with short necks and obtuse to subacute apex, hyaline, smooth, thin-walled.

Gill trama parallel, pale cinnamon in KOH, hyaline in H2O when fresh but with hyaline incrusting particles along the walls. Subhymenium not gelatinous. Pileus trama floccose-interwoven. Cuticle of compactly appressed enlarged hyphal cells with ochraceous walls in H2O when fresh, and dark rusty brown revived in KOH, the cells more or less ellipsoid (10-18 µ in diameter) and hyphae radial, pigment mostly in the wall, incrustations not conspicuous. Clamp connections present.

Habit, Habitat, and Distribution: Densely gregarious on burned soil, Idaho and Wyoming, June and July.

Observations: The lubricous pileus, dull reddish brown color, and mild taste distinguish it. In KOH the color of the spores would seem to suggest a relationship with Conocybe but the other characters do not bear this out.

Material Examined: IDAHO: Smith 44640 (type), 44809, 65015, 65056, 71453. WYOMING: Solheim 3957; Smith 34354, 34646, 34862.