MycoBank considers Russula lutea and Russula acetolens to be synonyms, but Index Fungorum does not. IF does indicate that there was a misapplication of the Russula lutea to something that was actually R. acetolens, so I’m giving it the benefit of the doubt. Specifically, IF says:
Russula lutea sensu auct., (also see Species Fungorum: Russula acetolens); Russulaceae
Both sites say that Russula lutea (Huds.) Gray is valid.
