|Major Groups > Gilled Mushrooms > Dark-Spored > Cortinarius > Cortinarius olearioides|
by Michael Kuo
Associated with hardwoods in eastern North America, this species of Cortinarius is a gorgeous shade of bright yellow when fresh and young. No, the mushrooms in the photos are not a gorgeous shade of bright yellow. I seem to have a problem when it comes to the charismatic species of Cortinarius, and I always seem to find them past their prime (see the page for Cortinarius violaceus for an even more painful example). As is the case for all the yellow to orange or brownish Cortinarius species with basal bulbs, the color of the young gills (yellow) and the morphology of the spores (see below) are crucial for identification of Cortinarius olearioides.
Cap: 5-15 cm; convex, becoming broadly convex or nearly flat; sticky when fresh; silky to bald; bright yellow when fresh and young, maturing to orange-brown or yellowish brown.
Gills: Attached to the stem; close; bright yellow at first, becoming orangish rusty brown.
Stem: 4-10 cm long; up to about 3 cm thick above; more or less equal above a swollen, rimmed basal bulb; pale to bright yellow, discoloring brownish; dry; bald or slightly hairy in places; often with rusty fibrils or a ring zone.
Flesh: Pale yellow to whitish.
Odor and Taste: Odor not distinctive, or fruity, or potato-like. Taste not distinctive.
Chemical Reactions: KOH red on cap surface; reddish on flesh.
Spore Print: Rusty brown.
Microscopic Features: Spores 9-12 x 5-6.5 µ; limoniform; coarsely and moderately to strongly verrucose. Pleuro- and cheilocystidia absent. Pileipellis an ixocutis of clamped elements.
REFERENCES: Rob. Henry, 1987. (Kauffman, 1918 [fulgens, fulmineus]; Kauffman, 1932 [fulgens, fulmineus]; Moser, 1983; McNeil, 2006 [fulgens]; Knudsen & Vesterholt, 2008.) Herb. Kuo 09260804.
Cortinarius subfulgens is a synonym. I suspect that both "Cortinarius fulgens" and Cortinarius fulmineus var. sulphureus as described by Kauffman (1918, 1932) on the basis of Michigan material represent Cortinarius olearioides as I am treating it
Further Online Information:
Cortinarius subfulgens at Roger's Mushrooms
Cite this page as:
Kuo, M. (2011, December). Cortinarius olearioides. Retrieved from the MushroomExpert.Com Web site: http://www.mushroomexpert.com/cortinarius_olearioides.html