Lactarius tabidus (also Lactarius theiogalus, and formerly Lactarius chrysorheus and Lactarius hepaticus), commonly known as the Birch Milkcap, is an inedible mushroom of the genus Lactarius. It can be found in North America and Europe, and grows at the base of pine in Autumn. Its white milk stains fabric a sulphur yellow, from which its specific epithet derives.