Bracket Fungus

A white bracket fungus, probably Trametes gibbosa, growing on a horse chestnut log (Aesculus hippocastanum).  The green colour is due to algae growing on its upper surface.

I took a specimen.  This is the upper surface:

And this is the lower surface:

There are about 2 of the slit-like pores per mm.

The specimen yielded the following spores (magnification x600, field width 86um):

These average about 3 x 1.5um which is a little smaller than the 4-5 x 2-2.5um given for T. gibbosa in this page at Mycobank.

First photo and specimen taken in Whiteknights Park, Reading, UK, on 2014-01-18.