Russula montana Schaef.
Cap 3.5-7cm across, convex-flattened, margin rarely striate; deep red to grayish red or reddish brown, sometimes with discolored areas; smooth; cuticle peels up to two-thirds cap radius. Gills fairly close, fragile; white. Stem 25-50 x 10-35mm, equal to clavate; white. Flesh soft; white. Odor none or slightly fruity. Taste strongly acrid. Spores subglucose, 7-10 x 6-8µ; warts up to 0.4µ high, with more or less complete reticulum. Deposit white to slightly cream (A-B). Habitat under conifers. Found in Colorado. Season July-August. Not edible. Comment Similar to Russula silvicola in the eastern states, but differing in its duller gray-red to brown-red cap