Other oak species and additional broadleaved species (very rarely).
Fruiting bodies emerge from areas of exposed heartwood on the stem of the tree and up in the crown upon scaffold limbs – this includes on pruning wounds and storm wounds. Persists on dead trees – sometimes abundantly.
Perennial. Tough and woody. Cuts quite easily with a blade. Upper surface generally a mixture of tan browns though can begin / be rimmed purplish-mauve. Flesh a light beige. Deep tube layer. Pore layer whitish-brown. Pores very maze-like – sometimes almost gilled. Unmistakeable.
No research has been undertaken on the pathogenicity of this fungus. On living trees, fruiting bodies highlight local areas of decay. Where fruiting bodies appear along the stem in multiple locations, coalesced decay column might form. Investigations into hollowness are only generally required in such scenarios.