Summary:
Subgenus Telamonia Section Uracei. Features include a strong unpleasant odor (though not perceived as unpleasant by everyone), a dark brown cap with yellow tints, a grayish yellow silky-fibrillose stem, a sparse yellow universal veil, and almond-shaped to elliptic, moderately verrucose spores. The description is derived from Niskanen(3).
Cortinarius nauseosouraceus is known from WA (where the holotype is from) and BC. An OR sequence is included in Liimatainen(11).
Cap:
3-6.5cm across, hemispheric to somewhat conic, later low convex to almost flat, often with umbo; strongly hygrophanous, dark brown with yellowish margin; "narrowly pellucid-striate when moist"
Flesh:
brown to dark brown in cap and stem, outermost 0.1-0.2cm pale yellow-brown
Gills:
"strongly to weakly emarginate". medium thick, medium spaced; "yellow brown when young, later brown to dark brown, edge yellowish"
Stem:
6-11cm x 0.4-0.9cm at top, 0.5-1cm at base, cylindric; "grayish yellow silky fibrillose"; basal mycelium yellowish
Veil:
universal veil "yellow, very sparse"
Odor:
strong, unpleasant, earthy or like green corn, present even in dried specimens
Microscopic spores:
spores (7.0)7.5-9.0 x 4.5-5.5 microns, narrowly elliptic to elliptic to somewhat amygdaloid, "moderately verrucose, somewhat more strongly ornamented at the apex, fairly strongly dextrinoid"; basidia 4-spored, 25-30 x 6-7 microns, clavate, colorless, some with yellow granulose contents in Melzer''s reagent; clamp connections present
Spore deposit:
[presumably a shade of brown]
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