Images of British Lichens
Caloplaca verruculifera (Vain.) Zahlbr.
Thallus greenish- or greyish-yellow to yellow, or infrequently brighter orange, placodioid with marginal lobes usually long and finger-like, pruinose, inner parts of thallus surface becoming covered by dense, globose or flattened-globose isidia; apothecia rare. Generally on nutrient-enriched coastal cliffs, often below below sea-bird colonies, in the north and west.
Refs: Smith et al. (2009), 273; Purvis et al. (1992), 158; Dobson (2005), 109 (photo, orange variant); Dobson (2011), 118 (photo, orange variant); Allen (2007), 14 (photo); Dalby & Dalby (2005), 10 (painting), 18 (photo); Whelan (2011), 63 (photo); Moberg & Holmåson (1984), 188 (photo); Stenroos et al. (2011) 90 (photo); Thomson (1997), 178 (photo, but description suggests colour variant); Brodo et al. (2001), 205 (photo); Lichen Atlas of the British Isles 6: 286 (2001).
Potentially can be confused with C. decipiens, which can occur on coastal rocks, but which is brighter orange and has globose soredia developing from soralia initially on the lobule margins, whereas C. verruculifera has globose isidia developing directly from the thallus surface.
|On shaded, vertical cliff-face below nesting sea-birds (by the jetty), Skomer, Pembrokeshire, May 2009|
|On vertical cliff-face, with C. littorea, wet and more greenish after heavy rain, Isle of Muck (BLS meeting), June 2012|
|Presumed C. verruculifera, dominant on cliff faces, Eilean nan Each (Horse Island), Isle of Muck (BLS meeting), June 2012|
|Caloplaca zonation, presumed C. littorea (bright orange) above presumed C. verruculifera (green-yellow), on cliff-faces used by nesting sea-birds,|
Isle of Muck (BLS meeting), June 2012
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Uploaded July 2009, last updated September 2013