Most poisonous fungus

The world's most poisonous fungus is the death cap (Amanita phalloides), which can be found worldwide, including North America and the UK, and is responsible for 90% of fatal poisonings caused by fungi.

Its total dry-weight toxin content is 7–9 mg (0.1–0.13 grains), whereas the estimated amount of amatoxins considered lethal for humans (depending on bodyweight), is only 5–7 mg (0.07–0.1 grains), which is equivalent to less than 50 g (1.75 oz) of a fresh fungus.

From 6–15 hours after eating, the effects are vomiting, delirium, collapse and death. Among its victims was Cardinal Giulio de' Medici, Pope Clement VII (b. 1478), on 25 September 1534.