Castlehead is known for its lichen flora. Although drier than most of the Atlantic Oakwoods of the Borrowdale valley, there were more than enough lichens to photograph and puzzle over. The tree lichens were not very accessible but Evernia prunastri, Ramalina and Usnea sp. can be seen in the picture above. Below is a closer view of a lichen that could be Tree lungwort(Lobaria pulmonaria) an indicator of ancient woodland.
Green shield lichen (Flavoparmelia caperata) hugs the branch on this Sessile oak.
More Green shield lichen and probably Rinodina roboris with the black apothecia.
Another green tree lichen (Parmotrema perlatum) with soralia on the margins.
Perusaria lichen was plentiful. This looks like P hymenea,
and this P pertusa.
An example of P leioplaca.
Graphis ‘writing lichen’ prefers smooth barked trees like Hazel. Opegrapha atra below,
and Graphis elegans.
On rocks there were Porpidia cinereoatra,
Not sure about this one but it looks like a Pertusaria.
And this could be Aspicilia calcarea which has an evident black prothallus.
I decided the top lichen was Physconia grisea due to the presence of lobes.