The North American Species of Pholiota

158. Pholiota chromocystis sp. nov.

Pileus 3-5 cm latus, obtusus deinde obtuse umbonatus, aurantiobrunneus, margine virido-flavus, viscidus, glabrosus vel sutbglabrosus. Caro olivacea deinde flavida; odore et gustu mitis. Lamellae adnatae, flavae deinde aurantio-brunneae, marginibus perflavae, angustae, confertae. Stipes 6-10 cm longus, 3-6 mm crassus, concolor, leviter fibrillosus. Sporae 6.5-8 x 4-4.5 µ Ieves, ellipsoideae demum phaseoliformes. Pleurocystidia 40-66 x 10-17 µ, aurea demum ferruginea vel hyalina; cheilocystidia similia, minora. Caulocystidia 26-50 x 10-18 µ, clavata demum subfusoidea. Cuticula gelatinosa. Specimen typicum in Herb. Univ. Mich. conservatum est; lectum in Sugar Island, Michigan, August 10, 1965. Smith 72040.

Pileus 3-5 cm broad, obtuse, expanding to obtusely umbonate, surface viscid, glabrous or nearly so, color bright greenish yellow over marginal half, becoming somewhat orange-fulvous over disc much as in Naematoloma fasciculare. Context thin, pliant, olivaceous moist, yellowish faded, with FeSO4 green; odor and taste not distinctive.

Lamellae adnate, crowded, narrow, yellow when young, in age orange-fulvous, soon darker rusty brown where damaged, in some the edges bright yellow.

Stipe 6-10 cm long, 3-6 mm thick, equal, fibrous, becoming hollow, pith orange-fulvous and cortex pale greenish yellow, surface concolor with cap margin or base soon pale tawny and drying about this color (not darkening markedly), thinly fibrillose, no annulus or distinct veil line present.

Spore deposit bright rusty brown on surrounding debris; spores 6.5-8 x 4-4.5 µ, smooth, with a minute pore, in shape elliptic to slightly bean-shaped in profile, nearly oblong in face view, rusty brown in KOH, paler in Melzer's.

Basidia 22-24 x 5-6 µ, 4-spored, hyaline in KOH in fresh condition, lemon-yellow as revived in KOH. Pleurocystidia 40-66 x 10-17 µ, hyaline or with golden-ochraceous to rusty ochraceous content, thin-walled, smooth as revived in KOH but at first often with an incrusted zone above the ventricose portion, apex subacute to obtuse, thin-walled. Cheilocystidia clavate to subfusoid to shaped like the pleurocystidia only smaller, bright yellow in KOH to hyaline. Caulocystidia scattered to clustered, not abundant, 26-50 x 10-18 µ, clavate to subfusoid, yellowish to hyaline in KOH.

Gill trama with a central area of non-gelatinous parallel hyphae with inflated orange-fulvous to ochraceous cells (in KOH), some with incrusting debris; subhymenium of somewhat diverging narrow more or less gelatinous hyphae hyaline in KOH. Pileus cutis a thin gelatinous pellicle of incrusted to smooth hyphae 2-6 µ diam., yellow in KOH; hypodermium of inflated orange-fulvous hyphae (in KOH) many with incrustations on walls. Context hyphae yellow in KOH, floccose, thin-walled, hyphal cells inflated to 15 µ or more. Clamp connections present.

Habit, Habitat, and Distribution: Subcaespitose in sphagnum, Michigan, August; Smith 72040, type.

Observations: This species reminds one of subgenus Flammula but has prominent pleurocystidia. Actually, in mounts revived in KOH the pleurocystidia are seen to be of two types, those with a colored content of amorphous material not arranged in any particular pattern, and those that are hyaline and homogeneous. The dried specimens are bright yellow, but the spores are not dextrinoid.