Fungus

A Peniophora sp fungus, probably Peniophora quercina, growing on an oak twig.

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

These are about 10x3um which is consistent with the 8–12 x 3–4um given for P. quercina at  RogersMushrooms.

First photo and specimen taken in Whiteknights Park, Reading, UK, on 2013-12-24.