I came away with no photos of the most obvious lichen - Xanthoria parietina,but it's so ubiquitous I felt like I didn't need to. I had in mind a trio of lichens that I was looking for, the first being Collemopsidium sublitorale, which makes its home on barnacles. After a while I located it without too much trouble.
another I was looking for - or at least one of a pair - was Lichina confidis, a small fruticose species. This one lives in the splash zone, while its congener prefers life lower down with the Verrucaria maura.
The third I was looking for was Ramalina siliquosa, which I didn't find on this brief exploration. I did find this rather nice Anaptychia runcinata though. It was relatively abundant.