Death Cap Mushroom

The death cap mushroom is the common name for *Amanita phalloides*, a highly poisonous fungus and one of the world’s deadliest mushrooms.

The death cap mushroom is the common name for *Amanita phalloides*, a highly poisonous fungus and one of the world’s deadliest mushrooms. It is responsible for a large share of fatal mushroom poisonings and is best known for containing heat-stable amatoxins that can cause severe liver and kidney damage if eaten.

Taxonomy and naming

The death cap is *Amanita phalloides*, a species in the genus *Amanita* and family Amanitaceae. Its common name reflects its severe toxicity and association with fatal poisonings.

Appearance and habitat

Death caps are typically found under trees, especially oaks and beeches, in mixed deciduous woods and similar environments. They are often encountered in parks, gardens, and urban wooded areas where host trees are present.

Toxicity and poisoning

The mushroom contains amatoxins, including α-amanitin, which can cause delayed gastrointestinal illness followed by serious liver and kidney injury. The toxins are not destroyed by cooking or other common food preparation methods. Symptoms of poisoning are often delayed for several hours after ingestion. Even a small amount can be lethal, particularly if not treated promptly.

Distribution and spread

Although native to Europe, the death cap has become established in many parts of the world. Sources note its presence in North America and Australia, where it has caused significant poisonings. Death cap mushrooms are a public-health concern in Canada because they are present in some urban and wooded environments and can be mistaken for edible mushrooms. Canadian public-health sources warn that ingestion can cause severe liver and kidney damage or death.