The North American Species of Pholiota

199. Pholiota jalapensis (Murr.) comb. nov.

Gymnopilus jalapensis Murrill, Mycologia 5: 25. 1913.
Flammula jalapensis Murrill, Mycologia 5: 36. 1913.

Illustrations: Text figs. 451-453.

Pileus reaching 8 cm in diameter, expanded, at length depressed at the center, ochraceous toward the disc and ferruginous-isabelline to fulvous at the center, slightly greenish when bruised, cremeous at the margin, surface smooth, moist to viscid, glabrous, margin curved downward and irregular or undulate. Context white, 5 mm thick near stipe; taste mild.

Lamellae adnate, stramineous, crowded, about 5 mm broad, ventricose near stipe, arcuate near the margin.

Stipe reaching 8 cm long and 10 mm thick, stramineous, equal below, slightly enlarged at the apex, glabrous. Veil showing a trace of a slight cortina at the middle.

Spores 5.5-6.5 (7) x 3-3.5 µ, smooth, apical pore very minute, often not visible; shape in face view oblong to elliptic, in profile slightly bean-shaped to subelliptic, color as revived in KOH ochraceous, not much different in Melzer's reagent; wall thin (-0.25 µ thick).

Basidia 18-23 (25) x 5-6 µ, mostly 4-spored, clavate, yellowish to hyaline in KOH, yellowish in Melzer's reagent. Pleurocystidia abundant, 50-77 x 10-16 µ, fusoid-ventricose, apex subacute to obtuse, neck narrow (4-6 µ), walls thin and smooth, content with some particles of amorphous material, ochraceous to yellowish or finally pallid, content often "colloidal." Cheilocystidia 38-60 x 5-18 µ, similar to pleurocystidia or merely subfusoid. Caulocystidia none found on specimen studied.

Gill trama with a gelatinous subhymenium, details of central area not too clear in revived material but hyphal cells about 5-8 µ broad. Pileus cutis a gelatinous pellicle (with some of the hyphae incrusted) over a rusty brown hypodermial zone of floccose, incrusted hyphae. Context hyphae poorly revived. Clamp connections present. All hyphae inamyloid.

Habit, Habitat, and Distribution: On soil, in woods, Mexico, December. Type studied.

Observations: This species has spores and lamellae paler than in most other terrestrial species. It is near P. hypholomoides, which has broader and darker spores.