Pink, then Grey, then Brown
This is the later phase of the Cauliflower Slime mould Enteridium lycoperdon. It was on the cut surface of a Weeping Willow log.
It starts white, with its characteristic morphology:
It then forms a skin which is initially (for how long?) pale pink. By 24 hours later, it is greyish and semi-transparent, stating to show small amounts of brown at the edges. By day 5 the skin has gone and the brown, powdery spores are falling away.
This one was ca 10cm across.
These images were taken last week and today. The stereos are crosseye.
Olympus EM-1, (aperture priority), Olympus 4/3 50mm f2 macro, f8, f11 and f13, hand-held.