Stock photo of the Eastern Yellow Fly Agaric toadstool a deadly poisonous psychoactive toadstool.The Eastern Yellow Fly Agaric scientifically named Amanita muscaria var.guessowii can easily kill a man who is unaware of its toxic properties. The fly agarics red and yellow are famous toadstools due to their beautiful appearance and due to the fact that they can be particularly deadly Toadstools. Normally the Fly Agaric is an inedible mushroom but can be prepared in such a way that makes consumption possible. Its toxins are also psychoactive and if prepared correctly. It used to be consumed by Siberian peoples and had a religious significance.