kills the roots of the pine plantations
- Size
- Bracket: 10-30 cm wide.
- Lifespan
- Perennial
- Diet
- Parasitic and saprotrophic, decomposing heartwood of conifers and broadleaf trees.
- Habitat
- On roots and stumps of conifers and broadleaf trees in native forest.
- Range
- Found in native and exotic forests throughout New Zealand, particularly in pine plantations.
- Endemism
- Introduced
- Main Threats
- Habitat loss from logging of old-growth forests and pine plantations.
- Population
- Common in pine plantations and native forests throughout New Zealand.
- Conservation Status
- Not Threatened
- Human Risk
- caution
- Handling Note
- inedible; do not ingest
- Conservation Note
- Introduced fungus; plant pathogen commonly found in pine plantations, not subject to conservation assessment.
- Te Ao Māori
- Māori names for specific bracket fungi are not recorded in standard dictionaries. In a kaitiakitanga framework, these fungi represent the necessary decay that sustains life. Their presence signals the age and health of the forest. Protecting them means preserving the natural cycles of growth and decline that define the ecosystem. The rot is not waste. It is fuel.
Without the Root Rot Bracket, the forest floor would be choked with dead wood. It is a decomposer, a silent worker that breaks down the dead to feed the living. The fruiting body is a bracket fungus, large and hoof-shaped. It attaches directly to the roots or base of the trunk, often partially buried. The upper surface is dark brown to black, rough and cracked like old leather. It is hard and woody to the touch. The underside is white or pale cream, covered in tiny pores rather than gills. These pores release spores into the air, carried by the wind to new hosts.
This fungus enters the tree through wounds or root contacts. The mycelium spreads through the heartwood, digesting the lignin and cellulose. This decay creates a white rot, weakening the structural integrity of the tree. The tree may live for decades with this condition, but it is vulnerable. A strong wind can snap it. A heavy snow load can break it. The fungus waits for the fall.
The Root Rot Bracket is found throughout New Zealand, from the northern forests to the southern beech lands. It is particularly common in pine plantations, where it causes significant economic damage. It fruits year-round, though the brackets are most visible in autumn and winter. It is not picky about its host, thriving on both native and introduced conifers and broadleaf trees. Its presence is a sign of decay in progress. Where it grows, lignin is being broken down. Nutrients are being released. The cycle continues.
Threats are minimal. The species is widespread and common. However, it is sensitive to changes in forest structure. Logging removes the old, diseased trees that the fungus depends on. Without these hosts, the population declines. The fungi wait for the forest to mature. They do not rush. It carries on.