English oak (mature / veteran / ancient).
Not confirmed from other species (incorrect historic record on beech).
Found on the main scaffold structure of the host tree (trunk and principal limbs) – persists on dead tree parts.
Annual . Soft and fleshy. Emerges as a white-yellow mass. Usually parasitized and aborted. Where brackets develop, the upper surface becomes a yellow-brown that may crack like a soufflé. Bruises brown. Pore layer off-white and becoming brown. Sometimes exudes yellow-brown liquid. Senescent brackets often disintegrate though may petrify a brownish-black.
Very infrequently observed. Limited generally to sites with many old oaks. Attributed to a cubical brown rot of the heartwood . Ecologically considered important. Protected under The Wildlife and Countryside Act 1981. Where suspected, Kew Gardens’ mycological department should be contacted. Confirmed findings should see the host tree protected.