Russula rhodocephala

Russula rhodocephala, also known as the redhead brittlegill, rosy russula, or redhead russula, is a species of gilled mushroom. It typically grows in association with pine trees. It is primarily found on the Pacific coast of western North America, although mushrooms with 97 percent genetic similarity are known from Asia. This species was formerly considered to be Russula sanguinaria, from which it has been recently separated due to differences in genetics and geographic distribution. It has an extremely acrid taste when raw, and is described as having a "disgusting" flavor when cooked. Another source describes it as having unknown edibility....read more on Wikipedia.