The North American Species of Pholiota

123. Pholiota adirondackensis sp. nov.

Illustrations: Text figs. 268-270.

Pileus 3-9 cm latus, companulatus vel convexus, demum plano-umbonatus, viscidus, pallide Iuteus demum olivaceo-luteus, ad marginem appendiculatus. Contextus luteus, odor pungens. Lamellae olivaceoluteae, angustae, confertae. Stipes 4-9 cm longus, 5-9 mm crassus, aequalis, luteus, deorsum demum fulvus. Sporae 6-7.5 x 3.2-4 µ. Pleurocystidia 50-75 x 9-18 µ fusoide-ventricosa, crassotunicata. Specimen typicum in Herb. Univ. Mich. conservatum est; legit prope Lake Placid, New York C. H. Kauffman, 2 Sept. 1914.

Pileus 3-9 cm broad, companulate-convex expanding to plano-umbonate, glabrous except for a zone of veil remnants near or along the margin, viscid, color at first evenly pale yellow ("wax-yellow") becoming olive-yellow ("olive-ochre" to "olive-lake"), the disc in age dull tawny. Context concolor with surface (yellow), thin, soft, odor rather strong in age (earthy to radish-like), penetrating; taste slight.

Lamellae at first olive-yellowish soon "olive-ochre" and then rusty brown ("Sudan-brown"), close, narrow, adnate to sinuate or in age subdecurrent, thin, edges yellow.

Stipe 4-9 cm long, 5-9 mm thick, equal or tapered downward, stuffed becoming hollow, pale yellow when young, soon dingy ferruginous below, naked at apex, thinly fibrillose elsewhere, no persistent annular zone.

Spores 6-7.5 x 3.2-4 µ, smooth, germ pore very minute, pale tawny in KOH and slightly duller in Melzer's reagent; in face view oblong, elliptic or ovate, in profile bean-shaped to narrowly elliptic, apiculus scarcely evident.

Basidia 4-spored, narrowly clavate, 17-23 x 5-6 µ, hyaline to ochraceous in KOH or in Melzer's reagent. Pleurocystidia abundant, 50-75 x 9-18 µ, fusoid-ventricose with obtuse apex, smooth or with amorphous debris adhering variously around apex, thick-walled (both in Melzer’s reagent and in KOH, at times the wall 3-4 µ thick, content hyaline to ochraceous in KOH and usually granular-colloidal. Cheilocystidia similar to pleurocystidia or smaller. Caulocystidia none.

Gill trama of somewhat interwoven elongate floccose hyphae 8-20 µ wide with pale tan to ochraceous smooth thin walls; subhymenium a broad gelatinous zone of narrow branched filaments, the layer pale ochraceous in KOH. Pileus cutis a gelatinous layer of nongelatinous-walled hyphae 2-4 µ diam. with fine incrustations over surface, the hyphae appressed-interwoven; hypodermium of broader (5-12 µ) more heavily incrusted rusty brown hyphae. Context hyphae 9-20 µ diam., smooth, walls thin and pale tan to greenish hyaline revived in KOH. Clamp connections present. All hyphae inamyloid.

Habit, Habitat, and Distribution: On mossy decayed spruce log, Lake Placid, Adirondack Mts., New York, Sept. 2, 1914. C. H. Kauffman, type.

Observations: This species was identified as Flammula lubrica by Kauffman and part of his description (Kauffman 1926), was drawn from his notes on it. It obviously cannot be Agaricus (Flammula) lubrica Fries as the colors are "wrong." That it is a distinct species in its own right can scarcely be disputed. The wax-yellow pileus becoming olivaceous, the yellow context, olive-yellow gills, yellow stipe which stains ferruginous and the large thick-walled pleurocystidia are outstanding.

It differs from P. olivaceophylla in having a yellow instead of a white pileus context, narrow gills, and cystidia with much thicker walls. Also, no rhizomorphs were noted for P. adirondackensis. P. flavopallida has white lamellae when young and a white stipe at first. It perhaps is closest to P. alabamensis but the type of that species has distinctly shorter (33 -50 µ long) pleurocystidia.