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Aspicilia contorta (Hoffm.) Kremp.
subsp. contorta
 
(= Circinaria contorta (Hoffm.) A.Nordin, S.Savić & Tibell 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; Dobson (2005), 74 (photo); Dobson (2011), 80 (photo); Whelan (2011), 52 (photo); van Herk & Aptroot (2004, 2013), 66-7 (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).

FGBI: http://fungi.myspecies.info/all-fungi/circinaria-contorta-subsp-contorta

 
Aspicilia contorta subsp. contorta
On paving, Saltash, Cornwall, August 2008
 
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
 
Aspicilia contorta subsp. contorta
On concrete wall capping, Paisley, Renfrewshire, March 2011
 
Aspicilia contorta subspp. contorta and hoffmanniana together
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 January 2016 (first hosted at www-biol.paisley.ac.uk, December 2006)