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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).

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

 
Aspicilia contorta subsp. hoffmanniana
Aspicilia contorta subsp. hoffmanniana, closer view
On concrete capping of wall, 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
 
Aspicilia contorta subsp. hoffmanniana
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)