blackens in the nutrient poor pasture
- Size
- Cap: 20-50 mm diam.
- Lifespan
- Unknown
- Diet
- Saprotrophic, decomposing dead organic matter such as grass roots and leaf litter in nutrient-poor soil.
- Habitat
- In short grassland, pasture, and forest margins with low nutrient levels and minimal fertiliser input.
- Range
- Found in grasslands and pastures throughout New Zealand, particularly in nutrient-poor soils and short turf.
- Endemism
- Native
- Main Threats
- Habitat loss from intensive farming, fertiliser use, and ploughing which destroys mycelial networks.
- Population
- Common in grazed pastures and grasslands throughout New Zealand, especially in unfertilised areas.
- Conservation Status
- Not Threatened
- Human Risk
- caution
- Handling Note
- inedible; do not ingest
- Conservation Note
- Native fungus; not assessed by NZTCS as fungi are generally outside the scope of current threat classifications.
- Te Ao Māori
- Māori names for specific waxcap species are not recorded in standard dictionaries. In a kaitiakitanga framework, these fungi represent the hidden health of the grassland. Their blackening flesh signals a biological response to disturbance. Protecting them means preserving the integrity of the pasture ecosystem and the unseen networks that sustain it. The colour change is a warning. It is also a signature.
It changes colour before your eyes. Pick the Blackening Waxcap, and the white flesh begins to stain orange, then red, then black. This is not decay. It is an oxidation reaction, a chemical defence triggered by damage. The cap is conical, sharp-pointed, and coloured a vibrant orange-red. It is smooth, waxy, and often sticky in wet weather. As it ages, the margins may fade, but the centre remains dark. It is a striking mushroom, visible from a distance. But touch it, and it bruises. The blackening is inevitable.
The gills are yellow or orange, attached to the stem and spaced widely apart. The stem is hollow, fragile, and coloured like the cap. It does not have a ring. It does not have a web. It stands alone, supporting the conical cap. The flesh is thin and brittle. It smells faintly of earth, nothing more. Unlike the Garlic Parachute, it has no distinct scent. Its defence is chemistry, not obscurity.
This fungus is saprotrophic. It feeds on dead organic matter in the soil, breaking down grass roots and leaf litter. In doing so, it releases nutrients back into the ecosystem. It is a recycler, working in the open spaces of the landscape. Without it, the soil would be less fertile. The grasses would struggle. The landscape would be poorer.
The Blackening Waxcap is found throughout New Zealand, from the northern pastures to the southern high country. It thrives in short grassland, particularly where the soil is nutrient-poor and the vegetation is kept low by grazing. It fruits in autumn and winter, often in large numbers after rain. It is not picky about its location, appearing in parks, lawns, and forest margins. Its presence is a sign of a healthy, unfertilised grassland. Where it grows, the ecosystem is balanced.
Threats are significant. The species is sensitive to fertiliser use and intensive farming. Nitrogen-rich soils favour aggressive grasses that outcompete the fungi. Ploughing destroys the mycelial network beneath the soil. Recovery is slow. The fungi wait for the conditions to return. They do not rush. It carries on. Despite these pressures, it remains common in less intensively managed areas.