The North American Species of Pholiota

21. Pholiota proximans var. proximans sp. nov.

Illustrations: Pl. 8a.

Pileus 1-3 cm latus, convexus, squamulosus, luteofulvus. Lamellae confertae, adnatae, luteae. Stipes 2-3 cm longus, 1.5-2.5 cm crassus, ochraceo-brunneus, tenuiter fibrillosus. Sporae 7-9 x 4-5 µ, leves. Pleurocystidia desunt. Cheilocystidia 26-35 x (9) 10-22 µ, clavata vel subvesiculosa. Specimen typicum in Herb. Univ. Mich. conservandum est; legit prope Tahquamenon Falls State Park, Michigan, 22 June 1955, Smith 49607.

Pileus 1-3 cm broad, convex with an incurved margin, expanding to broadly convex or nearly plane, surface dry and covered by minute erect cones of fibrils over the disc, toward margin the squamules recurved to appressed; color bright yellow brown ("auburn" to "Sudan brown") and not changing much in age. Context thin, yellow, slowly yellowish brown by maturity, odor none, taste mild.

Lamellae broad, close, depressed-adnate and readily seceding, dingy ochraceous young, concolorous with pileus when mature, edges even but minutely flocculose.

Stipe 2-3 cm long, 1.5-2.5 mm thick, becoming tubular, attached by a pad of mycelium, surface slightly fibrillose scurfy from a rudimentary veil, ochraceous overall when fresh and near "buckthorn brown" (dark clay color) in age, but not darkening from the base up on aging, with KOH soon dark rusty brown.

Spores in deposit "russet" to "tawny"; in H2O mounts golden tawny, dull cinnamon revived in KOH, in Melzer's reagent bright ochraceous tawny; 7-9 x 4-5 µ, elliptic to oblong in face view but not infrequently obscurely angular, in profile obscurely inequilateral to bean-shaped, wall slightly thickened, apical pore present but minute.

Basidia 18-22 x 5-6 µ, 4-spored, hymenium yellow in H2O fresh and as revived in KOH. Pleurocystidia none. Cheilocystidia 26-35 x 9-22 µ, with yellow walls in H2O fresh and as revived in KOH, narrowly clavate to nearly vesiculose, wall slightly thickened irregularly (appearing as if somewhat ornamented).

Gill trama hyaline or yellowish in H2O fresh, hyphae yellow in KOH on sections but hyaline as seen individually, walls thin and smooth to minutely asperulate, cells greatly elongated and 6-15 µ wide. Pileus cutis a trichodermium the hyphae separating into fascicles to form squamules, cells more or less inflated (15-20 µ wide), walls thin to somewhat thickened, rich reddish cinnamon in KOH, ornamentation fine but readily visible (not in the form of coarse plates and patches), terminal cells often cystidioid. Clamp connections present. All hyphae inamyloid.

Habit, Habitat, and Distribution: Gregarious on hardwood logs, Tahquamenon Falls State Park, Mich. June 22, 1955. H. E. Bigelow (Smith 49607, type).

Observations: This species differs from P. granulosa in that the stipe did not darken to a deep rusty brown from the base upward—and old basidiocarps were present in the collection—the gills are broad and become ventricose, and the terminal cells of the trichodermial hyphae show a tendency toward having thick walls in some hyphae of a squamule. The veil is rudimentary. Smith 66977 gave an olive black reaction with FeSO4. Apparently this is typical of the species, but the type was not tested when fresh.

Material Examined: IDAHO: Smith 53801. MICHIGAN: Smith 36658, 36693, 36871, 37049, 49607, 49645, 61068, 63514, 63516, 66969, 66977, 67011. NEW MEXICO: Isaacs 2687.