Misapplied name to west coast material.
“For many years the red form of Russula cremoricolor was identified as Russula emetica—a European species that North American authors have traditionally assumed to be present on our continent. Shaffer (1975) described it from North America as a species limited to habitat in sphagnum, possessing multi-septate pileocystidia; he created Russula silvicola for eastern North American collections from different habitats, featuring non-septate or sparsely septate pileocystidia. West Coast collectors subsequently began to apply the name Russula silvicola to the red form of Russula cremoricolor. Thus it would be inaccurate to reduce Russula silvicola to synonymy with Russula cremoricolor (which is the older of the two names), since Shaffer’s eastern species name was probably misapplied to West Coast material. Redecker and collaborators (2001) did not compare any of their California collections with eastern collections, nor with the type collection of Russula silvicola, from Cheboygan County, Michigan.”