The North American species of Pholiota, by Alexander H. Smith and L. R. Hesler.

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The North American Species of Pholiota

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.
42. Pholiota umbilicata sp. nov.
Illustrations: Text figs. 133-134.
Pileus 2-3 cm latus, campan ulato-convexus, umbilicatus, non viscidus,
"Sayal brown" deinde "pinkish buff," glaber. Caro concolor; odore ct
gustu mitis. Lamellae adnatae, "Sayal brown" vel "snuff brown," confertae, marginibus albo-fimbriatae. Stipes 3 cm longus, 2-3 mm crassus,
"bistre," flexuosus. Velmrn faciens fugacem annulum. Soorae 6-8 x 3.5 -4.5 pJ, ellipsoideae demum subovoideae, leves, truncatae. Pleurocystidia
16-18 x 4-5 FA, clavata demum ampullacea, pauca. Cheilocystidia 25-35
x 3-5 pu, filamentosa, gracilo-clavata vel ventricosa. Cuticula ex hyphis
repentibus composita. Specimen typicum in Herb. Univ. Mich. conservatum est; legit in Pend d'Oreille National Forest, Copeland, Idaho, legit L.
E. Wehmeyer, 11 Sept. 1922.
Pileus 2-3 cm broad, campanulate-convex, becoming umbilicate,
hygrophanous, not viscid, dull cinnamon ("Sayal brown") moist, fading
to pale tan ("pinkish buff") hence hygrophanous, at first margin faintly
translucent-striate, glabrous margin tending to remain decurved. Context
thin, pliant, concolorous with surface, 2 mm thicker near disc, thinner
at margin; odor and taste mild.
Gills broadly adnate, dull cinnamon ("Sayal brown" to "snuffbrown"), narrow, acuminate toward pileus margin, seceding, crowded,
edges white fimbriate.
Stipe 3 cm long, 2-3 mm thick, equal, dark yellow-brown ("bister"),
darker within, narrowly stuffed, flexuous, sligltly tapering, tough to
subcartilaginous, pruinose above the apical indistinct evanescent annulus,
below the veil-line variegated with white silky fibrils.
Spores 6-7.5 (9) x 4-5 (6.5) pt, ovate to broadly elliptic in face view,
obscurely inequilateral in profile, smooth, apex rather broadly truncate
from a prominent apical pore, in cross section terete to slightly compressed, pale cinnamon in KOH and ochraceous in Melzer's reagent
(paler), wall about 0.3 u. thick.
Basidia 15-20 X 6-7 /t, clavate, 4-spored, hyaline in KOH and
Melzer's reagent. Pleurocystidia rare, absent on some sections, 22-26 x
4-8 a, clavate-rostrate (like 1-spored basidia) to fusoid-ventricose or
nearly filamentous, hyaline, thin-walled. Cheilocystidia 25-36 X 4-8 Ft,
narrowly clavate to fusoid-ventricose or some nearly cylindric, very
delicate and difficult to revive. Caulocystidia present above veil-line,
similar to the cheilocystidia (subcylindric to clavate or somewhat fusoidventricose), thin-walled, delicate and reviving poorly.