[Tiggrx]

Originally Posted by JennyS

Hello Aaron, that must have been great trip to the Isles of Scilly but I don't think I'm going to be able to be much help with the lichen....

Cladonia pyxidata - Alan Silverside has some good information here re C. pyxidata and C. pocillum:
Cladonia pocillum (images of British lichens)

Caloplaca marina - doesn't look right
Caloplaca marina (images of British lichens)
and possibly it might be Caloplaca littorea instead
http://www.britishlichens.co.uk/spec...ea%20large.jpg

Both your Roccella's look good, though that is only from photo comparisons and details in Dobson's 'Lichens'

Not much help I'm afraid, you need AlanS for these!

Thanks Jenny, any help at all is appreciated. The Caloplaca littorea does look a rather better match than C. marina.

I think I have looked at every photo in Dobson over the past few days