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).

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]

Notes:
Cortinarius nauseosouraceus is known from WA (where the holotype is from) and BC. An OR sequence is included in Liimatainen(11).

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