Yellow "popcorn"-shaped plasmodium of a slime mold with older parts turning into burgundy, berry-shaped fruiting bodies.
I could barely see this and I didn't have my macro lens with me, but I am fairly certain this is a slime mold - just don't know which.
Second picture shows left fungus turned over. Very dry
Fragile fruiting on a mossy log, though it covered a large area (about 30cm x 45 cm). The white part disintegrates when touched, and has a pleasant vegetable-like smell.
Myxogastria or myxogastrids, formerly known as Myxomycota, is a class of Mycetozoa, itself a grouping of slime moulds, that contains 5 orders, 14 families, 62 genera and 888 species. They are colloquially known as the plasmodial or acellular slime moulds.