Images of British Lichens
Aspicilia contorta (Hoffm.) Kremp.
subsp. hoffmanniana S.Ekman & Fröberg
(= Circinaria contorta (Hoffm.) A.Nordin, S.Savić & Tibell
subsp. hoffmanniana (S.Ekman & Fröberg) A.Nordin, S.Savić & Tibell)
Differs from subsp. contorta (with which it may grow) in its sometimes darker colour, more scurfy surface and areoles more distinctly angled when conjoined and more closely packed at the thallus margin. Widespread, on soft limestones and becoming very common on concrete and on cement in urban areas. A. calcaria differs in its smooth thallus surface and well defined, often radially cracked thallus margin.
Refs: Smith et al. (2009), 185; Dobson (2005), 74; Dobson (2011), 80; Whelan (2011), 52 (photo, darker variant).
|On concrete capping of wall, 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
|On limestone, Schiehallion, Perthshire, April 2003|
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© A.J. Silverside
Uploaded March 2008, last updated January 2016
(first hosted at www-biol.paisley.ac.uk, December 2006)