the most lethal mushroom growing in NZ now

Size
Cap: 5–15 cm, Stem: 8–15 cm
Lifespan
1–2 years
Diet
Mycorrhizal: forms symbiotic relationship with roots of introduced broadleaf trees particularly oak and birch. Exchanges nutrients and water with tree receiving carbohydrates in return.
Habitat
Grows under introduced broadleaf trees particularly oaks. Forms large mushrooms with pale greenish-yellow cap white gills skirt-like ring and cup-like volva at the base.
Range
Throughout North Island and northern South Island under introduced oak birch and other broadleaf trees. Most common in urban parks and gardens in Auckland Wellington and Christchurch.
Endemism
Introduced
Main Threats
None. This introduced species is a public health hazard rather than a conservation concern. Controlled through public education and removal of fruiting bodies from parks and gardens.
Population
The most poisonous mushroom in the world responsible for 90 percent of fatal mushroom poisonings. Pale greenish-yellow cap with scattered white patches. Introduced to New Zealand with oak trees.
Conservation Status
Introduced
It acts as the silent assassin of the mushroom world. This is a fungus that is both beautiful and deadly. The Death Cap demands respect through its lethal potential. The cap spans five to fifteen centimetres across. It ranges from pale greenish-yellow to olive-brown. When wet, it becomes sticky. Scattered white patches cover the surface. They look like warts. Beneath the cap, the gills are white. They are crowded and free from the stem. The stem rises eight to fifteen centimetres tall. It is white to pale greenish. A large, skirt-like ring clings near the top. At the base, a cup-like volva anchors it. It looks like a mushroom that could be dinner. The resemblance is deceptive. It mimics an innocent field mushroom. It invites picking and cooking without a second thought. But this is the most poisonous mushroom in the world. A single cap contains enough toxin to kill an adult human. The toxins are called amatoxins. They attack the liver and kidneys. The damage is irreversible. There is no antidote. The symptoms take six to twelve hours to appear. By then, the damage is already done. It is a mushroom that kills slowly. The delay is part of the trap. Biologically, it is a mycorrhizal fungus. It forms a partnership with the roots of introduced oak and birch trees. The Death Cap cannot survive without its host. It arrived in New Zealand hidden in the soil of imported oak trees. It has spread slowly through cities. It follows the oaks. The distribution is linked to human planting. The expansion is steady. This is not a conservation problem. The Death Cap is a public health problem. Every year, people are poisoned by eating these mushrooms. They mistake them for edible species. The best defence is education. Know what a Death Cap looks like. Do not eat wild mushrooms unless absolutely certain of their identity. The risk is high. The margin for error is zero. Caution is mandatory. To find a Death Cap is to find a reminder that beauty can be deadly. The urban park is quiet. The mushroom grows under an oak tree. Its pale greenish-yellow cap and white gills look innocent. A forager walks past. They pause. They reach down. Then they stop. They remember the warnings. They walk on. The mushroom does not know it is deadly. It does not know it is a public health problem. It simply exists in the soil. It trades nutrients with the oak tree. That is its entire purpose. The most innocent-looking things in the forest can be the most dangerous. The Death Cap is proof. It carries on.