The North American Species of Pholiota

41. Pholiota deceptiva sp. nov.

Pileus circa 10 mm latus conico-campanulatus demum plano-umbonatus, lubricus, sordide melleus, demum pallide ochraceus; lamellae argillaceae, angustae demum latae, confertae, adnatae; stipes 1-2 cm longus, 1 mm crassus, aequalis, sursum pallide luteus, deorsum demum subfulvus; annulus fibrillosus; sporae 7-9.5 x 4-4.5 µ, leves, subtruncatae; pleurocystidia desunt; cheilocystidia 30-50 x 7-12 µ. Typus: Smith 63819 (MICH); legit prope Tahquamenon Falls, Michigan. 2 Aug., 1961.

Pileus about 10 mm broad, campanulate with a conic umbo, expanding to plano-umbonate much as in Galerina triscopa, surface subviscid to lubricous but soon dull, dingy honey-yellow and drying pale ochraceous.

Lamellae clay color mature, narrow to moderately broad, close, adnate, edges pallid-fimbriate.

Stipe 1-2 cm long, 1 mm thick, very slender, equal, yellowish above, very soon dark yellow-brown below, as dried evenly tawny overall (darker than pileus), with an apical fibrillose annulus and a few fibrils or fascicles of veil fibrils adhering below, apex pruinose.

Spores 7-9.5 x 4-4.5 µ, smooth, in face view ovate to elliptic, in profile mostly obscurely inequilateral, wall not more than 0.25 µ thick, apex slightly truncate from a distinct apical pore, bright cinnamon to ochraceous cinnamon in KOH, about the same color in Melzer's reagent.

Basidia 4-spored, 18-23 x 7-9 µ, subcylindric to clavate, hyaline in KOH, yellowish in Melzer's sol. Pleurocystidia none seen. Cheilocystidia abundant 30-50 x 7-12 µ, fusoid-ventricose, thin-walled and hyaline or near base the wall thickened slightly and ochraceous, fusoid-ventricose and tapered to an obtuse to subcapitate apex or with one or more absorted knobs near apex. Caulocystidia more or less similar to pleurocystidia.

Gill trama of parallel bright ochraceous-rusty-walled hyphae 3-9 µ in diam., walls scarcely thickened; subhymenium becoming cellular and at gill edge conspicuously so with the cells bright rusty ochraceous-walled in KOH and walls slightly thickened. Pileus cutis of appressed nongelatinous hyphae 3-6 µ diam.; The hypodermial region, which has cells enlarged to about 15 µ in the wider ones, the walls bright rusty ochraceous. Clamp connections present, all hyphae non-amyloid.

Habit, Habitat, and Distribution: On a hardwood log, Tahquamenon Falls State Park, Mich. Aug. 2, 1961. Smith 63819, type.

Observations: This species is peculiar because of the large cheilocystidia with the bright ochraceous slightly thick-walled cells at the base, and the Galerina triscopa aspect, but with spores having a truncate apex. In the dried material the gills appear moderately broad though on fresh material they were noted as narrow. P. tahquamenonsis has narrow cheilocystidia not bright ochraceous at base, and the basidiocarp hyphae generally are much less ochraceous when revived.