The North American Species of Pholiota
198. Pholiota brunneodisca (Pk.) comb. nov.
Flammula brunneodisca Peck, New York State Mus. Bull. 167: 42. 1913.
Gymnopilus brunneodiscus (Pk.) Murrill, North Amer. Flora 10: 199. 1917.
Pileus caespitose, 2.5-6 cm broad, broadly convex or nearly plane, umbonate, ochraceous-yellow, center brown, viscid, cuticle separable, slightly innately fibrillose. Context thin, white.
Lamellae adnate with a decurrent tooth, pale yellow, becoming rusty brown, thin, close, rather narrow.
Stipe 2-3 cm long, 4-6 mm thick, pale yellow within and without, paler at the apex, glabrous, equal, solid.
Spores 5-7 x 3-3.5 (4) µ, smooth, apical pore present but very minute, apex not truncate; shape in face view ovate to subelliptic, in profile subovate to obscurely inequilateral; in KOH ochraceous tawny, in Melzer's reagent mostly about the same color but one or two in a microscopic field seen to have dark violet brown coagulated contents; wall about 0.25 u thick.
Basidia 4-spored, 20-25 (27) x 5-6.5 µ, yellowish in KOH or in Melzer's reagent, mostly obscurely utriform when immature. Pleurocystidia 38-52 x 8-15 µ, fusoid-ventricose, neck with somewhat undulating walls and apex obtuse to rounded, wall thin, smooth or some with adhering coagulated amorphous material, content often amber-brown to ochraceous but fading out to pale yellowish or hyaline. Cheilocystidia 30-48 x 6-12 µ, subfusoid with obtuse apex, utriform or clavate, walls thin, content in KOH usually ochraceous. Caulocystidia not studied.
Gill trama a central area of floccose subinterwoven hyphae yellowish to hyaline in KOH, hyphae 4-9 µ broad, walls thin and smooth; subhymenium gelatinous, of tangled, narrow (± 2 µ) hyaline hyphae. Pileus cutis a thick gelatinous pellicle of narrow (1.5-3 µ) hyaline to yellowish interwoven hyphae; hypodermial region of rusty ochraceous floccose hyphae some with encrusted walls. Context hyphae paler (poorly revived). Clamp connections present. All hyphae inamyloid.
Habit, Habitat, and Distribution: Caespitose, on soil, probably growing from a buried root, Massachusetts, October. Type studied.
Observations: This species appears to be close to P. inocua but is the only Pholiota known to us with the curious almost amyloid (violet-brown) inclusion filling or nearly filling some spores.