Smoky Bracket Fungus

What I think is Bjerkandera adusta (smoky bracket fungus), growing on the trunk of a dead silver birch tree.  Bracket fungi species can be hard to identify on sight because they are so variable in form and colour.   However, in this case, I have based my identification on the similarities with photos here (to get the images, roll your mouse over the captions on the left), here and here.

Photos taken in the Wilderness, Whiteknights Park, Reading University grounds, Reading, UK, on 2010-03-13.