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Images of British Lichens

Caloplaca alociza (A.Massal.) Mig.

Thallus thin, grey, or immersed in the rock surface, often bounded by a black prothallus; apothecia with thick margins, black but usually covered by a blue-grey pruina, set in the rock surface and becoming slightly emergent at maturity. Very local on sunny, hard, limestone rocks in Wales and western England.

Refs: Smith et al. (2009), 252; Purvis et al. (1992), 145; Dobson (2005), 95-6 (photo); Dobson (2011), 104 (photo); Wirth, Hauck & Schulz (2013), 1: 276, 290 (photo); Lichen Atlas of the British Isles 6: 233 (2001).


Caloplaca alociza
Caloplaca alociza, close view
On coastal limestone, Stackpole, Pembrokeshire, May 2009

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Uploaded July 2009, last updated January 2016