the shaggy bracket slowly consuming NZ oaks
- Size
- Width: 10–20 cm
- Lifespan
- 1–2 years
- Diet
- Parasitic. Feeds on living wood of introduced oak trees. Grows on trunks of living oak trees, entering through wounds in bark and slowly rotting heartwood from inside out. Specialist pathogen of Quercus.
- Habitat
- Grows on trunks of living oak trees. Forms large, bracket-shaped brown to reddish-brown fruiting bodies covered in fine stiff hairs. Hoof-shaped to semicircular with thick woody texture. Underside has tiny brown pores.
- Range
- Throughout North Island and northern South Island on introduced oak trees in urban parks and gardens. Most common in Auckland, Wellington and Christchurch. Introduced from Europe with planting of oak trees.
- Endemism
- Introduced
- Main Threats
- None significant. Localised threats include removal of oak trees from parks and gardens. Habitat loss affects local populations. Generalist nature provides some resilience to environmental change.
- Population
- A bracket fungus on trunks of living oak trees. Large hoof-shaped brackets are brown to reddish-brown with fine stiff hairs. A parasite of oak trees, slowly rotting heartwood and eventually killing the tree.
- Conservation Status
- Introduced
The Oak Bracket is the silent killer of the oak tree. A fungus that takes decades to do its work. The fruiting body is a bracket. It measures ten to twenty centimetres across. The colour is brown to reddish-brown. It is covered in fine, stiff hairs. These give it a furry texture. It is hoof-shaped to semicircular. The feel is thick and woody. The underside is covered in tiny pores. These are brown to greyish-brown. A fungus that looks like it belongs on a horse. The appearance is rugged. The intent is lethal.
This fungus is a parasite. It grows on the trunks of living oak trees. It enters through wounds in the bark. It slowly rots the heartwood from the inside out. It can take decades to kill a mature oak. But eventually, the tree will weaken. The fungus will win. The Oak Bracket is so closely associated with oak trees that it is rarely found on any other host. A specialist killer. The target is specific. The outcome is inevitable. The process is slow.
Biologically, the Oak Bracket is a specialist. It is adapted to break down the unique chemistry of oak wood. It is a slow, patient, persistent decomposer. The fruiting body is annual. It appears in late summer and autumn. It produces a new crop of spores each year. The cycle is predictable. The damage is cumulative. The tree declines. The fungus persists.
The Oak Bracket is not edible. It is tough and fibrous. It has no culinary value. But it is a sign of the health of the oak tree. It is a warning that the tree is in decline. The visual cue is clear. The structural integrity is compromised. The risk is real. The observer must note it.
To find an Oak Bracket is to find a reminder. Even the mightiest trees have their enemies. The urban forest is a battlefield. Parasites and predators lurk in the bark. The struggle is silent. The result is visible. The oak tree stands in the park. It is old and grand. The bracket grows on its trunk. It is brown and furry. It slowly eats the heartwood. The tree does not know it is dying. The fungus does not care. It just rots. That is what it does. The intent is biological. The consequence is structural. The tree falls. The fungus moves on. Or it dies with the host. The cycle completes. The wood decays. The soil gains. And that seems to be enough.