Peltigera hymenina a Woodland Lichen
This was on the recumbent trunk of a woodland tree. The species changes from grey to black as it dries out. There were several colonies of various sizes on the tree.
The stereos are crosseye.
Olympus EM-1, (aperture priority), Olympus 4/3 50mm f2 macro, 1/20 & 1/50 at f8 ISO 3200, hand-held.