The North American Species of Pholiota

125. Pholiota flavopallida sp. nov.

Pileus 2-5.5 cm latus, plano-umbonatus, glutinosus, glaber, pallide flavus vel luteolus ad centrum subfulvus. Contextus luteolus. Lamellae angustae, confertae adnatae demum decurrentes, pallidae demum luteae demum brunneae. Stipes 3-4 cm longus, 3-5 mm crassus, aequalis, fibrillosus, deorsum subfulvus, sursum pallidus; velum album, fibrillosum. Sporae 5-6 (7) x 3-3.5 µ Pleurocystidia 40-56 x 12-17 µ, fusoide ventricosa vel subfusoidea, tenuitunicata vel rare subcrassotunicata (± 0.5 µ). Specimen typicum in Herb. Univ. Mich. conservatum est; legit prope Nordman, Idaho. 11 Nov. 1956. Smith 54485.

Pileus 2-5.5 cm broad, convex to plano-umbonate, glutinous, glabrous, marginal area pale yellow ("pale pinkish-buff" to "ivory-yellow"), disc clay-color to dingy pale tawny, margin lacerate at times. Context pallid becoming yellowish, green in FeSO4, odor not distinctive, taste mild.

Lamellae narrow, close, adnate to short decurrent, whitish becoming yellowish and finally dingy cinnamon to brown ("Verona-brown").

Stipe 3-4 cm long, 3-5 mm thick, white above, clay-color to rusty brown below, equal or base enlarged somewhat, thinly fibrillose from the poorly developed veil. Apex silky to silky-pruinose.

Spores 5-6 (7) x 3-3.5 µ, ochraceous to pale tan in KOH and merely tinged cinnamon in Melzer's reagent, smooth, apical pore exceedingly minute, wall thin (scarcely visible as a double line), in face view oblong to narrowly elliptic, in profile slightly bean-shaped to oblong.

Basidia 16-20 x 4-5 µ, mostly 4-spored, narrowly clavate, yellowish in KOH and in Melzer's sol. Pleurocystidia 40-56 x 12-17 µ fusoid-ventricose to subfusoid, obese, thin-walled or with wall up to 0.5 µ thick, smooth, apex rounded to obtuse, content often yellow in KOH when first revived. Cheilocystidia 27-45 x 7-12 µ, fusoid-ventricose to subfusoid, often with yellow homogeneous content in KOH, walls thin and smooth. Caulocystidia 48-76 x 10-20 µ, cylindric to clavate or capitate, rarely mucronate, thin-walled and smooth, wall hyaline to ochraceous. Stipe hyphae yellowish-hyaline in KOH.

Gill trama of parallel to slightly interwoven floccose hyphae with short or long inflated cells 8-20 µ diam., and thin smooth ochraceous to lemon-yellow or hyaline walls; subhymenium of gelatinous hyaline narrow (3 µ) hyphae. Pileus cutis a thick gelatinous layer of interwoven narrow hyphae 2-3 µ diam., hyaline to yellowish in KOH, and walls smooth or nearly so; hypodermium of floccose smooth-walled hyphae, rusty orange to ochraceous in KOH, and 4-12 µ diam. Context of interwoven hyphae with inflated cells, thin-walled, smooth, walls pale lemon-yellow to hyaline in KOH. Clamp connections present. All hyphae inamyloid.

Habit, Habitat, and Distribution: On conifer wood, Idaho, Smith 54485, type and Smith nos. 70998 and 71217.

Observations: The narrow crowded whitish gills, very small spores, and almost utriform cystidia are distinctive. The caulocystidia are versiform. This species at once reminds one of P. subochracea, but the cystidia distinguish them at once. Caulocystidia are present in both collections but less abundant on Smith 70998. The pileus gills and stipe are pale yellow as dried. When the stipe darkens in the fresh material this usually shows on the dried specimens.