Maybe old oyster mushrooms? Growing on rotting paper birch.
Very slimy and wet looking so I do not think it is the white carnival slime mould. See lower right to zoom in
@ryan_durand or @corndog -- this stuff was being fed on by chrome beetles and seemed to ride the line between slime mold and fungus, but for the oil-slick lustre and strange net-like margins
Looking at the rightmost group of four in the second and third photos... the dramatic color difference is entirely due to different lighting conditions between the photos, no saturation or other radical color processing
On rotten read alder branch in mountain stream.Plasmodium ressembles, but may not be, "Arcyria affines".pp69-69 Sarah Lloyd "Where the slime mould creeps. 4th edition, but the capitulum looks like Paradiachaeopsis, p.96?