As with many species of fungi, this one has no official common name. It is Lactarius uvidus, what I am calling the Purple-Staining Milkcap. This species thrives in North American and European forests around birch, aspen, spruce, and willow trees. The cap is either flat or indented, and it gives off a milky secretion that turns purple or lilac wherever it sticks on the fruiting body. Click the links below to find out more about this interesting fungus.