Cyanoboletus pulverulentus

Cyanoboletus pulverulentus, commonly known as the ink stain bolete, is a species of edible bolete mushroom. All parts of the mushroom will stain dark bluish-black after handling. It is found in deciduous and mixed forests, particularly on moist soil on slopes and under beech and oak trees. A common species, it is found in northern Asia, Europe, North Africa, Central and northern South America, and eastern North America. A recent study has revealed this mushroom hyperaccumulates arsenic compounds and therefore consumption should be limited....read more on Wikipedia.