There are a ridiculously large number of different kinds of lichen that grow in this kind of forest, far more than even the professional lichenologests (fun new word I made up) have had a chance to catalogue. So basically I'm trying to sort them by shape and a bit by colour, though with the larger, flat lichen it's a bit difficult to know which are different kinds and which are just variations of the same kind. The thin beard shaped lichen have more distinct characteristics and are easier to sort.
Lichen is absolutely fascinating. It's also creepily beautiful. It is a symbiotic life form, consisting of fungus and algae living together and 'lichen' it (ha ha, lichen sounds like like'n... it's a naturalist joke).