Lichen

I'm not great with crust lichens (or ID in general haha) so don't know where to start with this one. This lichen was found growing on a pressure treated wood fence post so my first impression was that the colour might be the result of copper accumulation from the treatment chemicals. Its also likely (maybe more likely?) that its just a species I haven't come across yet. I haven't really started the ID process and I may not get to it for some time but I'd love to hear other people's thoughts. I didn't have my KOH on me but this area is one I frequent so I will bring it next time and see if I can't get a sample for the microscope.