Hesler & Smith. 1979. “North American Species of Lactarius�? (page 512).
Cap size is 50% larger and the colors are a deeper, darker red than L. rubidus which usually starts as reddish brown and fades to beige; The stem is often twice the diameter of L. rubidus and often twice as long; The growth habit is in clusters of 2-6(9) and rarely fruits as singles like in L. rubidus; The taste is mild, but after about a minute (long time) the tongue starts to tingle but resist the urge to call it “acrid” because it NEVER gets hot. Latex is scanty to nonexistent and the color is variable from a beige white to completely watery, sometimes with whitish splotches. When dry, crushing the cap produces a tan liquid with a +/- whitish sheen. Odor when dried is nonexistent, lacking the smell of maple syrup.