The North American Species of Pholiota
76. Pholiota subgelatinosa sp. nov.
Illustrations: Text figs. 96-97.
Pileus 1-2 cm latus, obtuse conicus demum campanulatus, glutinosus, obscure vinaceo-brunneus, ad marginem ligno-brunneus, appendiculatus. Lamellae adnatae, latae, confertae, pallidae demum olivaceo-luteae. Stipes 3-5 cm longus, 2-3 mm crassus, albidus, peronatus; velum ligno-brunneum. Sporae (4)5-6(7) x 3-3.5(4) µ. Pleuro-chrysocystidia 20-30 x 8-14 µ. Cheilocystidia 20-35(45) x 5-10 µ. Specimen typicum in Herb. Univ. Mich. conservatum est; legit prope. Lake Tahkenitch, Oregon, 23 Nov. 1935, Smith 3599.
Pileus 1-2 cm broad, obtusely conic to campanulate or convex in age, glutinous when wet, near "wood-brown" along the margin, disc darker and nearest "Verona-brown" (dull reddish-vinaceous brown), virgate with agglutinated fibrils, margin appendiculate with fibrillose patches. Context rather thick (4 mm), firm, watery brown; no odor, taste none.
Lamellae rounded adnate, broad, close, whitish becoming faintly "Isabella color," or remaining pale, edges even.
Stipe 3-5 cm long, 2-3 mm thick, white, covered to near the apex by a sheathing fibrillose-layer (near "wood-brown") which breaks into concentric annular patches (1 or 2 near apex at least), squamulose below, equal, tough, hollow, interior olive-ochraceous or sordid yellowish.
Spores (4.5) 5-6 (7) x 3-3.5 (4) µ smooth, apical pore distinct and apex obscurely truncate in many; shape oblong to elliptic or slightly ovate in face view, in profile elliptic to obscurely bean-shaped, wall thin (0.25 µ), color in KOH pale ochraceous to ochraceous tawny, in Melzer's about the same color.
Basidia 4-spored, 18-23 x 4.5-5 µ, narrowly clavate, hyaline in KOH, yellowish-hyaline in Melzer's reagent. Pleurocystidia clavate, 20-30 x 8-14 µ, smooth, thin-walled, content with a refractive, amorphous hyaline inclusion (in KOH). Cheilocystidia 20-35(45) x 5-10 µ, versiform, clavate, cylindric, cylindric-subcapitate, fusoid-ventricose etc., smooth, thin-walled, hyaline in KOH, content homogeneous. Caulocystidia none.
Gill trama of a central area of floccose hyphae with thin, smooth ochraceous to hyaline walls, cells becoming inflated; subhymenium a gelatinous layer of narrow (2-3 µ) hyaline subparallel to interwoven hyphae. Pileus cutis, tangled and finally collapsing, the trichodermium of hyphae with encrusted (brownish) walls 5-10 µ diam., apical cells at times fusoid-ventricose, 30-50 x 10-15 µ, walls roughened, matrix translucent as if with gelatin between hyphae; hypodermial region of floccose rusty brown to ochraceous hyphae some with roughened walls. Context hyphae of inflated cells, thin walled, smooth and ochraceous to nearly hyaline in KOH. Clamp connections present. All hyphae inamyloid.
Habit, Habitat, and Distribution: On humus, Oregon, November.
Observations: This species is characterized by its gelatinous epicuticular hyphae which are agglutinated and give the pileus a virgate appearance, by clavate chrysocystidia, by its broad, close lamellae, and by small spores. The pileus is rather small and brown. It is near P. pusilla, which is pale-buff to yellow-ferruginous has narrow gills, and different cheilocystidia.
Material Examined: OREGON: Smith 3599 (type, from Lake Tahkenitch, November 23, 1935).