White Fungus

An unidentified white fungus growing inside a broken branch of an oak tree (Quercus sp).

The branch had recently fallen from the following tree:

The weakening caused by the fungus may have contributed to the branch breaking off.

I took the following specimen of the fungus home with me:

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

These are about 7 x 6.5um.

First two photos and specimen taken in the Wilderness, Whiteknights Park, Reading, UK, on 2014-03-02.