Species introCountry intro
Russula bicolor
I'm pretty sure this is the correct ID, but beyond the name and general description, information is hard to find...(and something bad has happened to Roger's Mushrooms! - it's down) I think it is closely related to Russula emetica, but I'm not sure what exactly is meant by R. emetica group. I think that in the past this was considered to be R. emetica, but that now it is either suspected or known to be a distinct species?
In any case this is known colloquially as "the sickener" - it won't kill you if you eat it, but it will make you vomit...
Roger's Mushrooms is back! info from his website
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.
