The slime mould sporangia from a few days back have now taken on a more definite grey colour, which is consistent with an identification of Badhamia utricularis. One or two sporangia even appear to have burst, releasing their spores.
While the yellow plasmodium has withered where the sporangia have developed, it is still thriving on other parts of the same log, as well as on nearby logs:
Photos taken in Whiteknights Park, Reading University grounds, Reading, UK, on 2010-02-03.
A white-shouldered house moth, Endrosis sarcitrella (Lepidoptera: Oecophoridae) on the wall of my bedroom back in October of last year. The grey markings on the wings can vary quite a bit. See here for a photo that matches the above one fairly well. This species is a widespread pest as its larvae feed on dry vegetable matter such as flour and clothing.
Photo taken in Reading, UK, on 2009-10-12.
Stag's horn fungus (Xylaria hypoxylon) growing on a moss-covered piece of wood. [Note added 2011-01-20: This is also known as candlesnuff fungus.]
Photos taken in Whiteknights Park, Reading University grounds, Reading, UK, on 2010-01-30.