Russula bicolor Burlingham
Cap 4-8cm across, convex then flattened; surface copper red mixed with yellow-orange or pale ochre; smooth, viscid when wet; cuticle separable for one-quarter of radius. Gills sub-crowded, broad; white. Stem 30-70 x 10-20mm, spongy; white. Flesh white. Odor not distinctive. Taste acrid. Spores ovoid, 8-10 x (6)7-8µ; warts less than 0.5µ, almost no connecting lines. Deposit white (A). Habitat particularly under birch. Found in both eastern and western North America. Season August-September. Edible. (Never eat any mushroom until you are certain it is edible as many are poisonous and some are deadly poisonous)