Russula xerampelina, also known as Crab Russula, is a medium to large agaric that has a hard-fleshed cap whose colour varies but is often dark red or purple. Mature plants have a fishy odour. All parts slowly stain dingy yellow-brown when cut or bruised.
convex, becoming later flat, with a broad, shallow depression. Surface sticky when moist, but soon dry; smooth - not streaked or warty. Colour most often dark red, but may be dark purple, pink, green or brown, often with traces of yellow. Gills broad, close to subsistent, adnate, yellowish-white. Stem
solid at first, later spongy. Surface white or flushed with pink; dry, smooth to wrinkled.
on the first-nature.com Web site.
on the MushroomExpert.Com Web site.