The Death Cap Mushroom, amanita phalloides, a deadly fungus, commonly mistaken for edible mushrooms. Ingesting one death cap mushroom is enough to kill a healthy adult and there is no antidote.
All parts of the mushroom are poisonous; cooking or peeling does not make the mushroom safe to eat. There is no way to remove the poison from the mushroom. The poisonous compounds are extremely stable. You cannot remove them by soaking, cooking or drying. The poisons are found throughout the cap, gills, stem and spores.
Death by death cap typically begins with severe vomiting, abdominal cramps, and diarrhea that comes on about 6-24 hours after ingestion.