While searching for lady beetle for my grand daughter at the backyard pear tree, found besides the orange yellow coloured Xanthoria polycarpa - Pincushion Sunburst, there are some similar in form, but different in colour and size (most like the head of a pin). Wonder if they are the same lichen in different stage of growth. Kindly have a look and enlighten me please.
Whoops sorry David - I missed seeing this post! Yes in the first photo it seems very likely to be X. polycarpa, based on size, colour, features I can see and those I cannot. The other four photos are likely one of the Lecanoras, the Rim lichens, but there are enough species in that genus in this region with a potential substrate match, that I can't make a guess based on photo, even with the lovely clear close-ups you have provided. If you are asking about the yellow-green on the rim lichens - I'm not sure but it seems more algal to me. I also wonder if it could be a Lecanora photobiont perhaps.
Thanks your effort to solve my puzzles. I understand it's difficult to ID from pictures alone. I leave that for now as bird migration is on.
