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Aspicilia contorta (Hoffm.) Kremp.
subsp. contorta


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; Wirth (1995), 1: 147, 149 (photo, more brownish variant); Dobson (2005), 74 (photo); Brodo et al. (2001), 169 (photo); van Herk & Aptroot (2004), 66-67 (photo).


Aspicilia contorta subsp. contorta
Disused limestone quarry, Tomphubil, Perthshire, April 2003
 
Aspicilia contorta subsp. contorta on rockface
Aspicilia contorta subsp. contorta
On basalt ledges in disused quarry, Luffness, East Lothian, March 2007
 
Aspicilia contorta subsp. contorta forming "chewing gum" patches on pavement
Aspicilia contorta subsp. contorta
Forming somewhat eroded, "chewing gum" patches on paving stones, Paisley, Renfrewshire, October 2008


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© A.J. Silverside
Uploaded March 2008, last modified June 2010 (first hosted at www-biol.paisley.ac.uk, December 2006)