Caloplaca maritima (images of British lichens)

Thallus an areolate crust, generally yellow, sometimes tinged orange, the areoles convex and seeming waxy, thallus margins at most scarcely lobed, sometimes bordered with a thin yellow to greyish (Arup) [or almost white (Dobson)] prothallus; apothecia deep yellow to orange yellow. Understood only relatively recently and under-recorded, but evidently frequent at least on the south and west coasts, on rocks, walls and concrete on and above the shore.

Refs: Arup (1997), Lichenologist 29: 503-512 (photos); Smith et al. (2009), 267; Dobson (2005), 105 (photo); Dobson (2011), 114 (photo); van Herk & Aptroot (2004), 102-103 (photo); Lichen Atlas of the British Isles 6: 280 (2001).

lastdragon.org

Images of British Lichens