Ganoderma australe the Southern Bracket Fungus
It was on a Silver Birch tree at Heath Lake Nature Reserve.
The stereos are crosseye.
Olympus EM-1, (aperture priority), Olympus 4/3 50mm f2 macro, 1/15 at f9 ISO 1000, hand-held.
This is a good example of the surprisingly long exposure in woodland on a sunny day.