Russula simulans has a smooth, streaky green cap that sometimes is violet or is spotted yellowish in the center. It is usually paler at somewhat striate at the margin, which remains inrolled to maturity The cuticle can be peeled back about half-way to the center. The gills are close, white, narrow near the margin and are forked at or near the stipe apex. The stem is white, as are the spores. Its taste is more acrid than its lookalike, Russula heterophylla.