moss and lichen

This past week has brought thunderstorms through our area, breaking off bits of the local trees. I picked up a couple of broken twigs during a walk yesterday, wanting to sketch the odd moss and lichen growing on them.

Both types grow in abundance on the trees here, but I am not familiar with either one of them. I've been looking for a field guide of moss and lichen but have not found one as yet.

I especially like this tiny lichen that grows on metal boxes and rocks as well as tree branches. An odd shade of pale gray-olive green, it looks a bit fey.