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).
|On brick capping of churchyard wall, Great Chrishill, North Essex (vice-county), July 2009|
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Uploaded August 2009, last updated January 2016