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toadstool mushroom fungus nature plant amanita muscaria orange white cap stem ring volva poisonous hallucinogenic mycology biology toxic deadly amanitin muscarine ibotenic acid pharmacology ethnopharmacology mushroom poisoning anticholinergic syndrome gastrointestinal symptoms neurological symptoms mydriasis tachycardia hypertension ataxia confusion delirium coma death treatment activated charcoal atropine intensive care prognosis prevention avoidance education public health