I was walking in the woods with some Blacksmith friends when we saw this rock. It was in a small wet spot on the trail with some flowing water.
I think there are two kinds of Lichen on the rock. One is mottled brown, and the other makes the interesting white and black pattern! I think the white and black must kill off or displace the other at it expands. It is both startling and pretty to find in the woods. At first I thought someone had made very intricate artwork on the rocks.