the deadly panther cap spreading through NZ parks

Size
Cap: 5–12 cm, Stem: 8–15 cm
Lifespan
5–10 years
Diet
Mycorrhizal. Forms symbiotic relationship with roots of introduced trees, especially oak, birch and pine. Exchanges nutrients and water with tree. Mutualistic association supports host health.
Habitat
Under introduced trees, especially oak, birch and pine. Forms mycorrhizal associations with tree roots. Prefers urban parks, gardens and exotic forest plantations with established hosts.
Range
Throughout New Zealand under introduced trees, especially oak and pine. Found in both North and South Islands. Distribution follows availability of suitable exotic host trees.
Endemism
Introduced
Main Threats
No significant conservation threats. Common and widespread. Not affected by habitat loss. Population stability is assured by ubiquity of suitable urban and exotic forest habitats.
Population
Populations considered stable and widespread. Common under introduced trees throughout New Zealand. Not considered threatened. No decline recorded in suitable modified environments.
Conservation Status
Not Threatened
Brown cap. White spots. It looks like a field mushroom, if you are not paying attention. The panther cap is a poisonous mushroom. Its brown cap is covered in small, white patches. These patches are remnants of the universal veil. This is the same structure that gives the fly agaric its warty appearance. The stem is white. It has a ring and a bulbous base. Cut it and the flesh stays white. No colour change. No warning. The deception is visual. The risk is chemical. It has a faint, radish-like smell. That is not a reliable indicator. Many mushrooms smell like radish. Some are edible. Some are not. The scent is misleading. The identification requires more than olfaction. It requires knowledge. It requires caution. It grows under introduced trees, especially oak and pine. In New Zealand, that means urban parks and exotic forests. It hitched a ride from Europe. It probably arrived in imported soil or tree roots. It has made itself at home in modified landscapes. The introduction was accidental. The establishment was successful. The spread is widespread. It is related to the deadly death cap. Same genus. Same toxins. The panther cap contains ibotenic acid and muscimol. These are the same compounds found in the fly agaric. Eating it causes hallucinations, nausea, dizziness and disorientation. It is not usually fatal. But it is not a good time. The experience is unpleasant. The consequences are neurological. The recovery is slow. The Māori name is not recorded. Another introduced fungus arrives without invitation. It brings its toxins with it. The lack of name reflects the origin. The presence reflects the adaptation. The tradition holds no record. The modern recognition is cautionary. It is not a conservation problem. It is a public health problem. Every year, someone mistakes it for an edible species. They regret it. The best defence is education. Know what a panther cap looks like. Do not eat brown mushrooms with white spots unless absolutely certain of their identity. The mistake is common. The lesson is painful. The spots can wash off in rain. Then it looks even more like a field mushroom. That is the danger. The rain erases the warning signs. The mimicry becomes perfect. The trap is set. That is the panther cap. Brown, spotted, poisonous. A mushroom that looks like dinner and acts like poison. The appearance is inviting. The reality is toxic. The fungus does not care for confusion. It cares for association. It finds it in the oak. It spreads in the park. It waits for the forager. And that seems to be enough.