The North American Species of Pholiota

133. Pholiota vinaceobrunnea sp. nov.

Illustrations: Pl. 61.

Pileus 2-5.5 cm latus, umbonatus, subviscidus ad marginem fibrilloso-squamulosus, glabrescens, sordide vinaceo-brunneus. Lamellae albidae demume ligno-brunneae, adnatae, angustae, confertae. Stipes 3-7 cm longus, 4-8 mm crassus, aequalis, solidus, sursum pallidus, deorsum vinaceo-brunneus, fibrillosus, sursum fibrilloso-zonatatus. Sporae 5.5-7 x 4-5 µ. Pleurocystidia 60-115 x 10-17 µ, crassotunicata. Specimen typicum in Herb. Univ. Mich. conservatum est; legit prope McCall, Idaho. 6 Aug. 1964. Paul Miller (Smith 68927).

Pileus 2-5.5 cm broad, obtusely umbonate expanding to plane or with a slight umbo, thinly viscid fresh but soon dry; color dark dull vinaceous-brown ("warm-sepia" to "Verona-brown") over the disc, dingy pale pinkish buff over marginal area but dingy tawny in between, at first decorated with 1-2 zones of veil fibrils or the fibrils occurring in scattered patches, glabrous in age or merely obscurely spotted. Context thin, fleshy-cartilaginous, with FeSO4 bluish olive, taste mild, odor none.

Lamellae whitish becoming wood-brown and finally dull pale cinnamon-brown, adnate, narrow, close, not becoming spotted, edges even.

Stipe 3-7 cm long, 4-8 mm thick, equal, solid, surface pallid above, soon more or less "Verona-brown" (dingy vinaceous-brown) at base, fibrillose from the thin pallid cortinate veil, rarely with a persistent zone of veil elements near apex.

Spore deposit cinnamon-brown; spores 5.5-7 x 4-5 µ, smooth, apical pore not evident, shape in face view subovate to elliptic, somewhat bean-shaped; color ochraceous tawny in KOH, pale tawny brown in Melzer's reagent.

Basidia 4-spored, 17-22 x 5-6 µ, yellowish in KOH, slightly more so in Melzer's. Pleurocystidia abundant 60-115 x 10-17 µ, fusoid-ventricose, apex obtuse or sometimes abruptly tapered to a spicule of a point, thick-walled (at least in the ventricose portion, 2-3 µ thick), arising deep in the subhymenium, content in neck portion often coagulated and dingy ochraceous in KOH and also in Melzer's; thickened walls hyaline in Melzer's. Cheilocystidia similar to pleurocystidia but smaller. Caulocystidia none found.

Gill trama of a parallel stratum of hyphae ochraceous in KOH and with smooth walls; subhymenium of gelatinous narrow (2-3 µ) interwoven hyphae in a gelatinous matrix, the hyphae with walls ochraceous and mostly with banded to spiral incrustations; beneath this a band of floccose hyphae 4-12 µ diam. with rusty colored patches of incrusted material (a hypodermium). Context hyphae pale ochraceous, smooth and cells 5-15 µ diam., walls scarcely darker in Melzer's reagent. Clamps regularly present.

Habit, Habitat, and Distribution: Scattered on conifer logs, summer and fall Idaho and Washington.

Observations: For a comparison with P. humii see that species. P. vinaceobrunnea is closest to P. decorata but differs in the thicker walled pleurocystidia. However, it is to be regarded as part of the P. decorata complex.

Material Examined: IDAHO: Smith 68927 (type), 71217, 73869. WASHINGTON: Smith 40486, 40494.