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Images of British Lichens

Caloplaca britannica R.Sant.

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). [Published photographs from continental Europe, purporting to this species, are best disregarded (see above).]

Caloplaca britannica with Caloplaca crenularia on coastal rocks
Caloplaca britannica, enlarged
In crevice in coastal rocks, with Caloplaca crenularia (orange apothecia), Millport, Great Cumbrae (Clyde Isles), April 2012,
Caloplaca britannica with Caloplaca marina on coastal rocks
Arbroath, Angus, April 2002, below C. marina, shot showing crevice habitat

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© A.J. Silverside
Uploaded March 2008, last updated December 2013 (first hosted at, January 2003)