Cortinarius sp.

Under mature Oak trees in heavy duff at the Reserve at Rancho Mission Viejo, Orange County, CA. 1/19/15. © Joanne Schwartz

Family: Cortinariaceae 

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The gills in Cortinarius are covered, when fresh, by a cortina/curtin of fibers. This eventually breaks, but by then the spores have matured and have begun to drop. Here the rusty brown spores have collected of the edge of the cortina.