The North American Species of Pholiota

23. Pholiota pseudolimulata sp. nov.

Pileus 10-20 mm latus, subumbilicatus, siccus, squamulosus, fulvus. Lamellae latae, distantes, adnatae. Stipes 1-2 cm longus, 1-1.5 mm crassus, sursutm luteus, deorsum fibrillosus. Sporae 7-9 x 4-5 µ. Pleurocystidia 26-30 x 5-8 µ, clavatorostrata. Cheilocystidia 26-35 x 9-18 µ, clavata. Specimen typicum in Herb. Univ. Mich. conservatum est; legit prope Emerson, Mich., 9 Aug. 1963, Smith 67107.

Pileus 10-20 mm broad, convex-depressed, the margin long remaining incurved, surface dry, covered over all except marginal area by very fine erect dull tawny brown fibrillose squamules, fibrils toward margin more appressed and not as well organized into squamules, ground color pale dingy ochraceous. Context thin, but not fragile, yellowish.

Lamellae broad, distant to subdistant, yellowish, when dried more rusty brown than pileus, adnexed, edges minutely floccose.

Stipe 1-2 cm long, 1-1.5 mm thick, equal fistulose, concolor with pileus below veil-line from fibrils and patches similar to scales on pileus, yellowish and faintly pruinose above, with a mycelial pad at base.

Spores 7-9 x 4-5 µ, elliptic in face view, slightly bean-shaped in profile, smooth, tawny in KOH and Melzer's reagent, with a minute apical pore. Basidia 4-spored, 18-23 x 4-6 µ, narrowly clavate, hymenium yellow in KOH. Pleurocystidia clavate-rostrate, 26-30 x 5-8 µ, neck narrowed to a needle-like apex, content homogeneous. Cheilocystidia clavate, 26-35 x 9-18 µ, wall thickened slightly and surface mottled from slight unevenness (or irregular wall thickenings?), walls bright ochraceous in KOH.

Gill trama parallel, hyphae with yellow walls that are non-gelatinous; subhymenium indistinct. Pileus cutis a trichodermium the elements of which become aggregated to form scales on the pileus, the cells of the hyphae inflated (up to 25 µ) and ovate to clavate; walls smooth to slightly incrusted, reddish cinnamon in KOH and thin. Clamp connections regularly present.

Habit, Habitat, and Distribution: Scattered on hardwood logs, Emerson, Mich. Aug. 9, 1963 (Smith 67107, type).

Observations: It is very doubtful if the pleurocystidia are one-spored basidia. No sign of a spore attached was ever seen and the material was in excellent condition. The clavate cheilocystidia immediately place this species near Naucoria limulata, see Josserand (1965). The distinctive features of P. pseudolimulata are the heavily incrusted hyphae, the pleurocystidia, and the habitat on hardwoods. At the present time we are not prepared to state that "Flammulla limulata" occurs in North America.