Conservation Status: Not of concern

Cortinarius riederi (=C. fulvo-ochrascens) is a medium-sized to larger species of the subgenus Phlegmacium characteristic of conifer forests across the Northern Hemisphere and is common and widespread in the PNW. The caps are various shades of brown, often with light grayish to bluish tones mixed in toward the margin, and the inrolled margin often bears patches or streaks of veil fibrils. The gills are persistently bluish and the cortina is pale blue at first. The stipe, at least when young, has some bluish gray tones above and, in age, it develops strong bronze to yellowish or brownish discolorations. The bulb at the base of the stipe often is turnip-shaped, without a distinct rim. The spores are broad and nearly ellipsoid, 11-14 x 6-8 um. The coloration of C. riederi is quite variable but to date trying to define distinct varieties has been a fruitless endeavor.

Sources: Trudell, Steve and Joe Ammirati. Mushrooms of the Pacific Northwest. Portland, Timber Press, Inc. 2009.