Lichen on wooden railway sleeper

I thought after yesterday that I would try photographing rock lichens today, but I was distracted by these tiny fruiting bodies growing on a railway sleeper seat we have in our garden. They are very tiny, do depth of field is limited even at f18. I did take some at f22, but preferred this one. I'm not very happy with it, though, and will have to have another try when I have more time.