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Images of British Lichens

Caloplaca crenularia (With.) J.R.Laundon

Thallus a thin, whitish-grey to grey, rarely almost black, cracked-areolate crust; apothecia rust-brown, when young with defined margins that remain somewhat lustrous even when dry. Usually on base-poor rocks, characteristic around the coast and locally common on often damp rocks and old walls inland.

Refs: Smith et al. (2009), 260; Purvis et al. (1992), 150; Dobson (2005), 99-100 (photo); Dobson (2011), 108-9 (photo); Allen (2007), 35 (photo); Whelan (2011), 59 (photo); van Herk & Aptroot (2004, 2013), 92-3 (photo); Wirth et al. (2004), 220 (photo); Valcárcel et al. (2003), 140-1 (photo); Lichen Atlas of the British Isles 6: 253 (2001).

Apothecia are commonly partly or wholly blackish (possibly fungal?). Such apothecia should not be confused with the similar C. ceracea, which has a layer of algae within the apothecium, turning it greenish when wet. Apothecial margins are matt, not lustrous, in C. ceracea.


Caloplaca crenularia
On sea-cliffs, Bettyhill, West Sutherland, August 2006
Caloplaca crenularia
Coastal rocks, Kennedy's Pass, Ayrshire, May 2008
Caloplaca crenularia
Coastal rocks, Portencross, Ayrshire, October 2008

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Uploaded October 2008, last updated January 2016