Cortinarius arvinaceus Fr. subgenus Myxacium Cap 4-8cm across, hemispheric for a long time, unexpanded with margin inrolled, sometimes with an umbo; yellow ochre, more reddish ochre with age; glutinous. Gills adnate; pallid, yellowish then rusty. Stem 50-120 x 7-15mm, usually thicker at the apex, attenuating downward; fibrous and flaky beneath the cortina of slime. Flesh whitish. Odor slight. Taste mild. Spores long elliptical, roughened, 10-14 x 6-7.5µ, quotient 1.8. Deposit rusty brown. Cheilocystidia bladder-shaped; no clamps. Habitat in coniferous and mixed woods. Uncommon. Found in the Rocky Mountains. Season August-September. Not edible. Comment This is a European species not previously recorded as far as I know in North America. Moser says the gills should be gray-brown, but Cooke shows yellowish gills in his illustration.