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Images of British Lichens

Caloplaca lucifuga G. Thor

A minute and inconspicuous species with a thin, grey, filmy thallus that may be immersed in the bark surface, and tiny, usually crowded, rounded, yellow to orange-brown soralia, which test purple with potassium hydroxide; apothecia unknown. An apparently rare species in crevices of rough bark of mature trees, most usualy Oak (Quercus); known from scattered localities in the north and west; first described as a species in 1988 and no doubt overlooked.

Refs: Smith et al. (2009), 266; Purvis et al. (1992), 154; Wirth, Hauck & Schulz (2013), 1: 271 (photo); Arup et al. (1997), 169 (photo); Thor & Arvidsson (1999), 242 (photo); Lichen Atlas of the British Isles 6: 1642 (2001).

Caloplaca lucifuga
On dry bark of Oak (Quercus), Logie (R. Findhorn), Morayshire, August 2010 (BLS meeting)

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Uploaded June 2011, last updated September 2013