Growing on small area of pilius and over gills and stipe of Russula species. Only a single mushroom from a large fruiting of Russulas was affected; the Russulas were light red with pale buff areas of the pilius, gills and stipe were white without bruising or other coloration, fruiting was located in mix of Picea engelmanii and Populus tremulloides ravine hillside. Light rain had been observed in the two days preceding this find.