The North American Species of Pholiota
183a. Pholiota groenlandica M. Lange, Meddelser on Grønland Bd. 148, Nr. 2 p. 7. 1957.
Pileus 6-7 cm broad, subglobose with strongly incurved margin, then convex and finally almost flat or even slightly depressed, at first covered by whitish coating, which soon disappears without breaking up in patches, leaving the cap naked, viscid-shining, pale Russet (h 1); cuticle detachable, elastic, hyaline; flesh thick almost to the edge, firm, pallid watery brownish; cap margin with a dense white slimy veil; gills rather broad, narrow towards margin, moderately crowded, 40 L, many very short 1, decurrent, pale yellowish brown (k 4, Cream-Buff), slightly darker and less bright when spores ripen, margin concolorous, entire; stipe 8 x 1.2 -1.5 cm, cylindrical, slightly widened above, base thickened, pallid yellowish brown above, darker, Cinnamon Rufous (e 4) in lower two thirds, especially where touched, hollow, flesh concolorous, base felty, apex finely white-pruinose, fibrillose downwards, somewhat slimy when young, especially above.
Smell and taste faible. Sporeprint Tawny-Olive Clay Color.
Cuticle a thick layer of strongly gelatinizing hyphae, often thickened slightly and bright golden brown; gill trama similar, subbanded structure; trama of loosely woven, subhyaline hyphae, in places regular, hyphae 6-8 µ broad, some yellowish lactifers seen; pleurocystidia numerous, springing from deep subhymenial layer, lower half inflated, tapering towards apex, some of them subcapitate or forked, upper part filled with yellowish brown refractive content, 50-65 x 11-14 µ; cheilocystidia similar; basidia very small, about 16 x 4-6 µ, 4-spored, sterigmata long; spores small 5.3-6.7 x 3.2-4 µ, elliptic subphasaeoliform, pale Clay Color, with very small apiculus and an obscure small germ-pore.
Quite closely related to Pholiota lenta (Pers. ex Fr.) Singer from which it differs but slightly in microscopic characters, but the covering of the cap never breaks up in scales, the colours are darker, and the whole plant of coarser stature.
Habit, Habitat, and Distribution: Only known from the type locality, where it was found in three places in the same large Salix glauca copse, in deep moss with Deschampsia flexuosa. We have not examined material since the species is very readily characterized.
Observations: The above account is from Lange's original description and in the main his format is retained. The species belongs in stirps Lubrica of our classification by virtue of the cystidia and small spores, but we have seen nothing like it. In veil features it reminds one of our P. velaglutinosa. It is a most interesting Pholiota because of its occurrence in relation to Salix, the viscid stipe, large pleurocystidia, and veil remnants over the pileus. Anyone collecting in northern Canada should be on the lookout for it.