Amanita muscaria (Fly agaric) is a highly poisonous mushroom that can have a red or yellow cap, The cap often has white warts on the surface and there maybe a veil and enlarged volva at the base of the stalk. It is called a fly agaric because some folks would put pieces of the mushroom in a small bowl of milk in order to entice and kill flies. In Siberia some people would drink a tea made from this mushroom for its hallucinogenic effects, others would drink the urine from those that ingested this mushroom to avoid some of the unpleasant side effects. The ferociousness of Viking Berserkers has also been attributed to eating this mushroom before battle Davis et. al. 2012 Field Guide to Mushrooms of Western North America , page 36).


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