Today I found this Cladonia lichen in the woods on a large fallen log among the moss. The trunk has been there for a long time. It's mostly moss-covered, elsewhere the bark has been worn away by scarecrows or fallen to the ground. Fortunately, this area is not a logging area, no one removes dead wood. Typical Cladonia shapes look like cups or tubes, and are about five millimetres in size at most.