Images of British Lichens
Aspicilia contorta (Hoffm.) Kremp.
Thallus of scattered to confluent, chalky-grey, more or less rounded, convex areoles, margin of thallus effuse, with dispersed areoles; apothecia one or more per areole. Common on base-rich rocks, also as a "chewing-gum lichen" forming circular colonies on pavements (compare Aspicilia contorta subsp.hoffmanniana, Lecanora muralis).
Refs: Smith et al. (2009), 184; Purvis et al. (1992), 98; Dobson (2005), 74 (photo); Dobson (2011), 80 (photo); Whelan (2011), 52 (photo); van Herk & Aptroot (2004), 66-67 (photo); Wirth (1995), 1: 147, 149 (photo, more brownish variant); Valcárcel et al. (2003), 122-3 (photo); Wirth, Hauck & Schulz (2013), 1: 190, 368 (photo, as Circinaria contorta); Brodo et al. (2001), 169 (photo).
|On paving, Saltash, Cornwall, August 2008|
|Disused limestone quarry, Tomphubil, Perthshire, April 2003|
|On basalt ledges in disused quarry, Luffness, East Lothian, March 2007|
|Forming somewhat eroded, "chewing gum" patches on paving stones, Paisley, Renfrewshire, October 2008|
|On concrete wall capping, Paisley, Renfrewshire, March 2011|
|Aspicilia contorta subsp. contorta (left and right) with subsp. hoffmanniana (centre), together on concrete capping of wall, Paisley, Renfrewshire, March 2011|
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© A.J. Silverside
Uploaded March 2008, last updated October 2013 (first hosted at www-biol.paisley.ac.uk, December 2006)