Laccaria amethystina

Laccaria amethystina, commonly known as the amethyst deceiver, or amethyst laccaria, is a small brightly colored mushroom. Because its bright amethyst coloration fades with age and weathering, it becomes difficult to identify, hence the common name "deceiver". This common name is shared with its close relation L. laccata, which also fades and weathers. Recently, some of the other species in the genus have been given the common name of "deceiver". It is found mainly in Northern temperate zones, in deciduous and coniferous forests, though it is reported to occur in tropical Central and South America as well. The mushroom is edible, but can absorb arsenic from the soil....read more on Wikipedia.