Beech, hawthorn, hornbeam, lime, maple, plane, poplar, willow.
Typically restricted to the base of the tree and out on buttress roots. Tends to fruit in the same / a proximal location each year. Found more routinely in warmer areas of England (south).
Annual . Tough and slightly rubbery. Upper surface often varnished (photo a). Begins as a golden-yellow to white mass. Often rimmed golden-yellow to white. Pore layer white. Spore brown. Flesh a chocolate-coffee brown. Rubbery. Very hard to cleanly slice with a blade.
Attributed to a selective white rot of wood. Can cause basal cavity formation. Prompts buttress development. Parasitic . Considered more aggressive on American oaks and Turkey oak. Decay can be subterranean. Where a tree lacks buttressing, investigations into structural stability are more acutely necessary. Where targets exist, investigations into structural stability and stem hollowness are recommended.