The world's deadliest mushroom is the Amanita phalloides, the death cap. The five different poisons contained by the mushroom cause diarrhea and vomiting within 6 to 12 hours of ingestion. This is followed by damage to the liver, kidneys, and central nervous system - and, in the majority of cases, coma and death.

The Amanita phalloides, commonly known as the death cap mushroom, is indeed considered the world's deadliest mushroom. It contains multiple powerful toxins including amatoxins, phallotoxins, and virotoxins. The described progression of symptoms - initial diarrhea and vomiting within 6-12 hours, followed by liver, kidney, and central nervous system damage, potentially leading to coma and death - is accurate for death cap poisoning. It is responsible for the majority of fatal mushroom poisonings worldwide.