[AlanS]

Yes, as Deer Stalker and Mike Anderson have already posted, this is a slime mould, in its immature fruiting stage. The cytoplasmic connections between the "blobs" are still visible.

It is not a Nectria, as the individual fruiting bodies would each be set into the rotting wood, not in a disorganised pile like this. Also, Nectria is a "flask fungus", with a tiny opening for spore release at the top of each fruitbody.

As for Bisporella citrina, this is a cup fungus that indeed can be very conspicuous on fallen wood, usually on beech but sometimes on other deciduous trees. However, the individual fruitbodies are tiny discs, i.e. flat or slightly concave on top, and again each is individually attached to the wood. To be blunt, if a fungus book has a picture of B. citrina that looks like Black's photograph, then I suggest throwing the book away!

Alan