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Images of British Lichens



Caloplaca chlorina (Flot.) H.Olivier


Thallus blue-black, cracked areolate, with a sparsely to densely granular-blastidiate surface; apothecia said to be rather rare, with orange discs and thick, greyish thalline margins. On rocks and walls, rarely bark, throughout Britain but evidently more frequent in the east.

Refs: Smith et al. (2009), 257; Purvis et al. (1992), 153 (as C. isidiigera); Dobson (2005), 98 (photo); Dobson (2011), 108-9 (photo); van Herk & Aptroot (2004, 2013), 90-1 (photo); Wirth, Hauck & Schulz (2013), 1: 280, 295 (photo); Holien & Tønsberg (2008), 156 (photo); Soun et al. (2011) Lichenologist 43: 113-135 (photo); Lichen Atlas of the British Isles 6: 263 (2001).

This species has been considered synonymous with C. isidiigera and both names have been used for British material. However DNA analysis (Vondrák et al. (2008), Lichenologist 40: 375–386) indicates that they are separate species. C. isidiigera has true isidia; C. chlorina has soredia/blastidia sometimes aggregated into isidia-like structures. The lichen illustrated here is C. chlorina in the strict sense. C. isidiigera is apparently not known in Britain but might occur on montane limestone. The rare C. aractina is also markedly similar but lacks blastidia and isidia.

FGBI: http://fungi.myspecies.info/all-fungi/caloplaca-chlorina (images perhaps show water-soaked material)

 
Caloplaca chlorina, with apothecia, close view
Caloplaca chlorina, with apothecia, close view
On brick capping of churchyard wall, Great Chrishill, North Essex (vice-county), same colony as below, April 2012
 
Caloplaca chlorina
Caloplaca chlorina, with apothecia
Caloplaca chlorina, with apothecia
Caloplaca chlorina, with apothecia
On brick capping of churchyard wall, Great Chrishill, North Essex (vice-county), July 2009


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Uploaded August 2009, last updated January 2016