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Images of British Lichens

Aspicilia calcarea (L.) Mudd
(= Circinaria calcaria (L.) A.Nordin, S.Savić & Tibell)

Thallus a chalky white (to pale blue-grey), smooth to cracked-areolate crust, margin well-defined, usually with radial cracking; apothecia set in the thallus, with black discs, or initially grey-pruinose, one or more per areole. On hard limestone, often common and forming conspicuous, large, circular patches. Fletcher et al. (in Smith et al., 2009) state that it has been over-recorded on concrete in urban areas, such records generally being referable to A. contorta subsp. hoffmanniana.

Refs: Smith et al. (2009), 184; Purvis et al. (1992), 98; Dobson (2005), 73 (photo); Dobson (2011), 79 (photo); Whelan (2011), 51 (photo); Wirth (1995), 1: 147, 149 (photo); Wirth et al. (2004), 246 (photo); Wirth, Hauck & Schulz (2013), 1: 190, 368 (photo, as Circinaria calcarea); Moberg & Holmåson (1984), 110 (photo); van Herk & Aptroot (2004, 2013), 66-7 (photo).


Aspicilia calcarea
Aspicilia calcarea, close view
Limestone pavement with Aspicilia calcarea, Perthshire
On limestone pavement, Schiehallion, Perthshire, April 2003
Aspicilia calcarea
Aspicilia calcarea, close view
On coastal limestone rocks, Sand Bay, Somerset, February 2010 (BLS meeting)

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© A.J. Silverside
Uploaded March 2008, last updated January 2016 (first hosted at, December 2006)