This is a rather large Russula that darkens considerably with age.
Cap with white back ground becoming black or dark brown quickly, not turning red,
Gills whitish at first or with dark spots, darkening to black or dark brown when cut or bruised,
Spore print white (A),
Stalk white at first becoming dark brown or black,
Flesh white at first darkening to blackish when bruised or cut without reddish stains,