Summary:
Features include a slimy, dark olive-gray-brown cap, white gills, a long slender slimy white stem, and large spores. The description is derived from Hesler(1) except where noted.
Hesler(1) examined collections from WA, OR, and CA. There is a collection from BC at the University of British Columbia.
Cap:
2-5cm across, at first broadly bell-shaped with mammillate umbo and incurved margin, becoming flat; 'surface beneath "buffy olive" with the umbo "clove brown," margin slightly paler'; glutinous from colorless veil, bald, "the surface often uneven from the drying gluten", margin membranous, (Hesler), dark olive-gray-brown, becoming paler at the margin, (Stuntz)
Flesh:
thin; white, unchanging; in stem white
Gills:
adnate with a tooth becoming subdecurrent, close to subdistant, 0.3-0.4cm broad, thickish, waxy, a few forked; pure white
Stem:
(4)5-10cm x 0.3-0.6(0.8)cm, equal or slight ventricose [wider in middle] and narrowed at base; whitish, when old tinted like cap from the drying veil; covered at first with the colorless glutinous sheath, (Hesler), lacking a sheath of fibrils beneath the slime sheath (Stuntz)
Veil:
colorless glutinous veil on cap and lower stem
Microscopic spores:
spores (10)12-18(20) x 7-9 microns, elliptic, smooth, inamyloid; basidia 4-spored, 55-71 x 7-12 microns; pleurocystidia and cheilocystidia absent; gill tissue divergent; clamp connections present on cuticular hyphae
Spore deposit:
[presumably white]
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