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).
|On limestone pavement, Schiehallion, Perthshire, April 2003|
|On coastal limestone rocks, Sand Bay, Somerset, February 2010 (BLS meeting)|
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Uploaded March 2008, last updated January 2016
(first hosted at www-biol.paisley.ac.uk, December 2006)