The North American Species of Pholiota

144a. Pholiota occidentalis var. luteifolia var. nov.

Pileus 2.5 (6) cm latus, convexus, viscidus, minute squamulosus glabrescens, cinnamomeus. Lamellae pallide luteae latae, adnatae, confertae vel subdistantes. Stipes 2.5-6 cm longus, 3-6 mm crassus, sursum pallidus, deorsum fulvus. Vellum pallidium. Sporae 6-7 x 3.5-4 µ. Specimen typicum in Herb. Univ. of Mich. conservatum est; legit prope Upper Priest Lake, Boundary Co., Idaho. 13 Oct. 1966. Smith 74169.

Pileus 2-5 (6) cm broad, convex with an incurved margin, expanding to plane or slightly depressed, thinly slimy and at first with minute squamules of veil remnants which are soon removed, at times finally more or less areolate, tawny cinnamon on disc, pallid to yellowish pallid on margin in age, margin at first fringed with pallid fibrils from the veil. Context pliant, watery brownish, odor and taste not distinctive, FeSO4 slowly olivaceous.

Lamellae pale yellow when immature, dull cinnamon when mature, close to nearly subdistant, broad, broadly adnate to short decurrent, thin, edges even.

Stipe 2.5-6 cm long, 3-6 mm thick, stuffed, equal, pallid above, becoming rusty cinnamon from the base upward, veil thin, fibrillose, pallid, leaving scattered fibrils on the stipe.

Spores 6-7 x 3.5-4 µ, smooth, with scarcely any sign of an apical pore (very minute); shape in face view elliptic to ovate, in profile obscurely bean-shaped to obscurely inequilateral, wall about 0.25 µ thick; pale dull cinnamon in KOH, in Melzer's reagent no appreciable change.

Basidia 16-25 x 6-7.5 µ, 4-spored, clavate many yellow in KOH from a colored content. Pleurocystidia 50-70 x 10-16 µ fusoid-ventricose, content as revived in KOH yellow, walls up to 1 µ thick in ventricose part in many of the individuals, some with adhering material near the base of the neck. Cheilocystidia similar to the pleurocystidia but shorter. Caulocystidia up to 20 µ broad, clavate to vesiculose or fusoid-ventricose, yellow to hyaline, walls thin or some with thickened walls in pedicel, content hyaline to yellowish, granular in apex in some.

Gill trama with a central area of parallel to subparallel hyphae with thin smooth walls hyaline in KOH, cells finally considerably inflated; subhymenium gelatinous, of narrow, branched hyphae. Pileus cutis a gelatinous pellicle of ochraceous encrusted hyphae 3-5 µ diam. with outlines very distinct; hypodermium of bright ochraceous fulvous hyphae in KOH, the walls somewhat roughened and cells more or less enlarged. Context hyphae hyaline to greenish-hyaline in KOH, closely arranged, walls thin and smooth. Clamp connections present.

Habit, Habitat, and Distribution: On conifer slash, Upper Priest River, Boundary County, Idaho. Oct. 13, 1966. Smith 74169, type.

Observations: This poses a problem recurring throughout the subgenera Flammuloides and Pholiota: Namely variants distinguished by the presence of yellow pigment in some part of the basidiocarp in species not normally having it. This situation caused confusion between P. lenta and P. gummosa in North America. We found it in P. terrestris in 1947 and 1966, in P. occidentalis as described here, and the degree to which yellow is evident in the P. spumosa complex causes confusion there. Its development may also be associated with partial sterility as we have noted many times in Naematoloma.