Caloplaca britannica (images of British lichens)

Thallus yellow to orange, of small, radiating, convex lobes or subsquamules, bearing numerous, minute, spherical granules (coralloid isidia) that form mounds on inner areas if the thallus. One of several yellow to orange Caloplaca species on coastal rocks in the spray zone, typically in crevices; scattered records around the British coasts where hard rocks exist, but undoubtedly under-recorded. Also reported on walls inland, especially on the continent, but such records refer to other species, notably C. arcis (see Smith et al.).

Refs: Smith et al. (2009), 255; Purvis et al. (1992), 147; Dobson (2005), 96-7 (photo); Dobson (2011), 105 (photo); Whelan (2011), 57 (photo); Lichen Atlas of the British Isles 6: 1689 (2001).

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Images of British Lichens