The North American Species of Pholiota

162. Pholiota pseudopulchella sp. nov.

Illustrations: Text figs. 353-355.

Pileus 1-2 cm latus, conicus demum conico-umbonatus, obscure vinaceo-brunneus, squamulosus demum glaber, viscidus. Contextus luteus. Lamellae subdecurrentes, luteae demum Iuteo-brunneae, confertae, latae. Stipes 3-4 cm longus, 2-4 mm crassus, pallide luteus, deorsum, sparse fibrillosus. Sporae 7-9.5 x 5-6.5 µ, leves. Pleurocystidia 43-80 x 9-15 µ, fusoide ventricosa; tenuitunicata vel tunica 0.5 µ crassa. Caulocystidia nulla. Specimen typicum in Herb. Univ. Mich. conservatnm est; legit prope Grants Pass, Ore., 14 Nov. 1956. Smith 55641.

Pileus 1-2 cm broad, more or less conic and umbonate, then expanding-convex, disc natal brown to near vinaceous-drab, elsewhere paler, veil squamules present at first, then glabrous, viscid, margin even. Context thin, yellow.

Lamellae adnate-decurrent, yellow at first, then "buckthorn brown," close, broad or medium broad, edges uneven to fimbriate.

Stipe 3-4 cm long, 2-4 mm thick, pale yellowish, with scattered fibrils or squamulose, equal, hollow. Veil copious, yellow.

Spores 7-9.5 x 5-6.5 µ, smooth, apical pore minute but distinct (NA 1.4 ob.); ovate to subelliptic in face view, in profile elliptic to obscurely inequilateral; color in KOH rusty brown, revived in Melzer's reagent more cinnamon; wall about 0.25 µ thick.

Basidia 25-35 (37) x 7-9 µ, 4-spored, narrowly clavate, yellowish to yellowish hyaline in KOH and more yellowish in Melzer's reagent. Pleurocystidia 43-80 x 9-15 µ, fusoid-ventricose, the neck tapered to a subacute apex, smooth or with some debris adhering (in KOH), walls thin to thickened up to 0.5 µ, content homogeneous. Cheilocystidia similar to pleurocystidia but usually shorter. Caulocystidia none.

Gill trama a floccose central strand of subparallel hyphae, the walls as revived in KOH thin smooth and yellowish to hyaline, cells very elongated; subhymenium of subparallel hyaline narrow (2-3 µ) gelatinous hyphae in a narrow to broad zone (very broad in young material). Pileus cutis a gelatinous layer up to 250 µ thick of somewhat radially arranged narrow (2 µ ±) smooth, thin-walled hyphae; hypodermial region of rusty brown encrusted hyphae 3-6 µ diam. in a narrow band. Context hyphae with thin smooth walls, yellowish in KOH. Clamp connections present. All hyphae inamyloid.

Habit, Habitat, and Distribution: On conifer debris, Grants Pass, Ore., Nov. 14, 1956; Smith 55641, type.

Observations: This species has duller colors than in P. pulchella; especially as dried the pileus has a dull brown tone, but the important difference is shown by the spores which have thinner walls and in no way remind one of the spores of P. subangularis. The absence of caulocystidia in P. pseudopulchella should be checked on additional fresh material as these cells are easily missed in mounts of revived material in species where the veil is heavy.