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Caloplaca flavescens (Huds.) J.R.Laundon


Thallus yellow to orange, placodioid (i.e. a crust but lobulate at the margins), often with a whitish zone at the base of the lobules, more obvious in intact thalli (but seen also in related species), lobules convex, generally slightly pruinose; apothecia deeper orange and crowded in the centre of the thallus. Easily confused with C. aurantia, which has more flattened lobules, and with C. decipiens, which is sorediate towards the centre of the thallus. Common, especially in the south and east, on calcareous rocks, walls and cement.

Refs: Gaya (2009), 109, 187 (photo); Wilk (2012), 21 (photo), 45-7; Smith et al. (2009), 262; Purvis et al. (1992), 151; Dobson (2005), 101-2 (photo); Dobson (2011), 110-11 (photo); Allen (2007), 33 (photo); Whelan (2011), 60 (photo); Wirth (1995), 1: 216, 231 (photo); Wirth et al. (2004), 235 (photo); Wirth, Hauck & Schulz (2013), 1: 284 (photo), 285; van Herk & Aptroot (2004, 2013), 94-95 (photo); Moberg & Holmåson (1984), 186 (photo, as C. heppiana); Lichen Atlas of the British Isles 6: 259 (2001).

FGBI: http://fungi.myspecies.info/all-fungi/caloplaca-flavescens

 
Caloplaca flavescens
Caloplaca flavescens
Caloplaca flavescens on wall
Longniddry, East Lothian, May 2007
 
Caloplaca flavescens
Caloplaca flavescens
Caloplaca flavescens
On limestone rocks, Arncliffe, Yorkshire, June 2009
 
Caloplaca flavescens, surrounded by C. citrina
On coastal cliff face with C. citrina, Arbroath, Angus, April 2002


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© A.J. Silverside
Uploaded March 2008, last updated January 2016 (first hosted at www-biol.paisley.ac.uk, January 2003)