The North American Species of Pholiota

56. Pholiota depauperata (Singer & Smith) comb. nov.

Kuehneromyces depauperatus Singer & Smith, Mycologia 38: 513. 1946.

Pileus about 17 mm broad, convex, subumbonate, strongly hygrophanous and almost subviscid, deeply sordid melleous when water-soaked, fading to pale pinkish buff and then becoming more ochraceous ("pale yellow-orange" to "light ochraceous-buff"), translucent-striate when moist. Context subconcolorous, watery and fleshy in the pileus, somewhat tougher in the stipe; odor none.

Lamellae adnexed to adnate, olive-fuscous at maturity, medium broad (2-2.5 mm), moderately close.

Stipe about 2.3 cm long, 2 mm thick, blackish fuscous, darkening from the base upward, nearly equal, tubular, base white-mycelioid, lower portion thinly fibrillose, nearly glabrous above.

Spores deep honey-color under the microscope, 6.2-6.8 x 3-4.4 µ, in face view elliptic to ovate varying to subrhombic, in profile convex on the ventral line (in optical section), wall smooth and double, apex truncate.

Basidia 14-20 x 5.8-6.3 µ, 4-spored. Pleurocystidia none. Cheilocystidia 27-29 x 6-7 µ, ventricose below, ampullaceous above, the neck 2-4 µ thick, sometimes cylindric to subconic above, rather uniform in size and distribution. Gill trama of interwoven hyphae. Pileus cuticle gelatinous; hypodermium of brown-walled hyphae, not structurally differentiated. Clamp connections present.

Habit, Habitat, and Distribution: Solitary on decaying mossy trunk of hardwood tree, Florida, July. Singer F2992, type.

Observations: All the features of this species are typical of Psilocybe, especially the cheilocystidia, spore size and shape, and color of the mature gills. Ordinarily we would have simply relegated it to the excluded and doubtful category, but in view of what we now know about Pholiota it can be recognized as a species in this genus. Since the collector considered it brown spored, we follow this lead pending positive proof that this is wrong.