The North American Species of Pholiota

160. Pholiota pulchella var. pulchella sp. nov.

Illustrations: Text figs. 350-352; pl. 65b.

Pileus 2-3.5 cm latus, obtusus demum late campanulatus, obscure vinaceobrunneus, fibrillose squamulosus, glutinosus vel viscidus. Contextus subolivaceus. Lamellae adnatae, subdistantes, latae, subolivaceae. Stipes 3-6 cm longus, 3-4.5 mm crassus, aequalis, olivaceo-luteus, deorsum fibrillosus. Sporae (6) 6.5-8.5 (9) x 5-7 (7.5) µ, leves, crassotunicatae. Pleurocystidia (38) 50-81 x (8) 12-16 µ, fusoide ventricosa. Caulocystidia 37-56 x 8-15 µ, clavata vel subventricosa. Specimen typicum in Herb. Univ. Mich. conservatum est; legit prope Port Angeles, Wash. 21 Sept. 19-1. Smith 17083.

Pileus 2-3.5 cm broad, obtuse when young expanding to obtusely campanulate or finally nearly plano-umbonate in age, disc "Natal brown," sometimes becoming "wood-brown" to "avellaneous" (dark vinaceous brown to gray-brown); margin shading off to "pale olive-buff," usually decturved a long time; surface at first with scattered delicate yellow fibrillose scales from the broken veil; viscid to glutinous, fibrillose-streaked beneath the slime, usually with small patches of veil tissue along the margin. Context thick on the disc and tapered abruptly away from it, pliant, "olive-buff" or more or less greenish watery gray; odor none, taste mild or faintly bitterish.

Lamellae bluntly adnate but soon slightly depressed and toothed, broad (more or less 6 mm), horizontal, subdistant (24-28 reach the stipe, 2-3 tiers of lamellulae), "pale olive-buff" or a little more green when young, near "buffy-brown" in age, or finally more rusty from the spores, edges fimbriate.

Stipe 3-6 cm long, 3-4.5 mm thick, equal or narrowed below, hollow, "chartreuse-yellow" (greenish yellow) at least at the apex, surface "seafoam-yellow" above, slightly brighter below, lower two-thirds covered by delicate zones or patches of more or less "clay-color" fibrils which are the darkened remains of the veil, apical region delicately fibrillose-farinose, base delicately fibrillose-strigose.

Spores (6) 6.5-8.5 (9) x 5-7 (7.5) µ, smooth, apical pore distinct but apex not truly truncate, wall up to 0.5 µ thick; shape in face view broadly ovate to almost angular-ovate at times varying to broadly elliptic, in profile mostly obscurely to merely somewhat inequilateral or obscurely angular-elliptic, apiculus very inconspicuous; color in KOH reddish tawny, paler in Melzer's reagent.

Basidia 4-spored, 22-30 x (5) 6-8 µ, clavate, hyaline in KOH, yellowish in Melzer's reagent. Pleurocystidia (38) 50-81 x (8) 12-16 µ, fusoid-ventricose with acute to subacute apex, varying to fusoid, walls thin and hyaline, content homogeneous or with scattered rods and granules. Cheilocystidia similar to pleurocystidia but smaller, content often evenly yellowish. Caulocystidia 37-56 x 8-15 µ, clavate to subventricose, in tufts, hyaline or with brown pigment, walls yellowish in KOH.

Gill trama of a central portion with parallel hyphae, 6-15 µ diam., the cells short or long, the walls thin smooth and yellowish in KOH; subhymenium a gelatinous layer of narrow hyphae hyaline in KOH and interwoven. Pileus cutis a thick gelatinous pellicle of loosely tangled narrow (2-4 µ) hyaline to yellow hyphae often with asperulate walls; hypodermial zone of floccose hyphae with pale to dark tawny incrustations on walls, hyphae 4-10 µ diam. Context hyphae inflated to 15 µ +, thin-walled, ochraceous to nearly hyaline and smooth, all hyphae inamyloid. Clamp connections present.

Habit, Habitat, and Distribution: Scattered or solitary, on conifer debris and humus, Washington, Oregon, and Idaho, September-October.

Observations: The broadly ovoid, dark brown, thick-walled spores are distinctive. The young gills are "olive-buff," or greenish watery gray. Field characters include the small size, and heavy veil development. It is related to Pholiota pseudopulchella, which has larger, paler, ellipsoid spores with thinner walls. It also is a connecting species to P. subangularis as the spore shape, color in KOH and the thickness of the wall are all very suggestive. The latter however, lacks pleurocystidia.

Material Examined: IDAHO: Smith 55262, 55337; OREGON: Smith 24806, 25060, 28184; WASHINGTON: Cooke 18592, 18831, 21777 (MICH); Smith 17083 (type), 17231.