 The name of the mushroom in many European languages is thought to be derived from its use as an <unk> when <unk> in milk . This practice has been recorded from <unk> and Slavic @-@ speaking parts of Europe , as well as the <unk> region and pockets elsewhere in France , and Romania . <unk> Magnus was the first to record it in his work De <unk> some time before <unk> , commenting <unk> fungus <unk> , <unk> <unk> in <unk> <unk> <unk> <unk> , " it is called the fly mushroom because it is powdered in milk to kill flies . " 
