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Images of British Lichens

Caloplaca flavocitrina (Nyl.) H.Olivier

Forming an areolate crust and closely similar to C. 'citrina', differing in the areoles typically being more greenish yellow, with bright yellow soredia forming initially at the areole margins (though later covering the surface as in C. 'citrina'); apothecia with margins not or hardly sorediate. Widespread and common, on base-rich rocks, mortared walls, concrete and on base-rich bark.

Refs: Arup (2006) (photo); Wilk (2012), 10 & 24 (photos), 66-7; Smith et al. (2009), 262; Dobson (2005), 102 (photo); Dobson (2011), 111 (photo, poorly printed); van Herk & Aptroot (2004, 2013), 96-97 (photo); Wirth, Hauck & Schulz (2013), 1: 287, 301 (photo).


Caloplaca flavocitrina
On brick capping of churchyard wall, Great Chrishill, North Essex (vice-county), July 2009

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© A.J. Silverside
Uploaded August 2009, last updated January 2016