Lactarius acris is a member of the large milk-cap genus Lactarius in the order Russulales. Found in Europe, the species was described in 1821 by British botanist Samuel Frederick Gray.[1] It is considered unpalatable due to its strong flavour, but the bitterness can be removed by repeated washing and salting.[2]
This is the only species in the Lactarius genus whose milk turns pink after a few moments of exposure to air. The cap has between 5 and 8 cm in diameter and is chestnut brown and becomes sticky when wet.