The North American Species of Pholiota

9. Pholiota squamulosa (Murr.) Kauffman, Amer. Journ. Bot. 13: 29. 1926.

Gymnopilus squamulosus Murrill, North Amer. Fl. 10: 201. 1917

Illustrations: Text figs. 7-8.

Pileus 2 cm broad, convex, not fully expanding, uniformly ferruginous, gibbous, surface dry, finely squamulose. margin entire, concolorous.

Lamellae adnate, ferruginous to fulvous at maturity, crowded, broad, plane, edges yellowish and somewhat crenulate.

Stipe 2 cm long, 2 mm thick, tapering downward, short, subconcolorous, fibrillose, rather tough.

Spores 8-9.5 x 4-5 µ, smooth, lacking an apical pore; in face view ovate to elliptic, in profile slightly bean-shaped to obscurely inequilateral, in KOH tawny to pale tawny, in Melzer's reagent nearly hyaline, walls about 0.3 µ thick.

Basidia 20-25 x 6-7 µ, 4-spored, yellow in KOH, nearly hyaline in Melzer's reagent. Pleurocystidia none. Cheilocystidia 36-52 x 7-11 µ, narrowly clavate to filamentous with a capitate apex, content clear yellow in KOH, wall thin, smooth and hyaline. Caulocystidia not studied (material insufficient).

Gill trama of subparallel hyphae with cells becoming inflated to 12 µ or more in places, walls ferruginous-brown in KOH, smooth to asperulate, subhymenium of narrower hyphae than the central area but otherwise the same. Hyphae of context with yellow walls in KOH and nearly hyaline in Melzer's reagent, cells 6-14 µ diam. or more inflated, walls thin and smooth to (rarely) minutely asperulate. Cuticle not reviving well but no pigment-encrusted hyphae found, dark red-brown in KOH (the typical color change for the group, only very accentuated). Clamp connections present. All hyphae inamyloid.

Habit, Habitat, and Distribution: On dead wood near the New York Botanical Gardens, Sept. 13, 1910. Known only from the type locality.

Observations: The type material was so scanty that no sections were attempted to determine if caulocystidia were present. We recognize this species provisionally since the possibility of its being P. muricata is not excluded. The data that are obtainable from the type are admittedly inadequate. However, it is significant that no sphaerocysts were seen in the sections made of the pileus cuticle, and no heavy pigment incrustations were observed on the cuticular hyphae.