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Shows well-developed Physcia adscendens and/or P. tenella (adscendens has hood shaped lobe ends, but in tenella they bend back instead, but it's difficult to separate then sometimes and some lichenologists think it just two forms of the same species). I'm not sure about the greenish stuff amongst it, but it looks isidiate so it may well be Pseudevernia furfuracea. The underside is very distinctive if you can get back there and have look with a hand lens; the margins of the lobes curl over so as to almost cover the back, which is black in older specimens, but pinkish-white when young. Unlike Evernia, it is stiff and is never sorediate. It is very common in Scotland, mostly on pine trees, but quite rare lowland Britain, mainly on wooden fence posts, but the Beds f.c.r was growing on thatch on Mark Powell's house!
Developing this app for P&Z zoning requests online. - via www.twitxr.com/broodwich/updates/21117 - Location: 50201