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Images of British Lichens

Caloplaca arcis (Poelt & Vězda) Arup

A tiny, bright yellow or orange-tinted Caloplaca that forms rosette-like clusters of areoles, minutely squamulose or lobed at the margins and bearing spherical blastidia up to 0.1mm across; apothecia with yellow-orange discs, thalline margins generally persistent. Widespread and locally frequent on walls and in churchyards, undoubtedly much overlooked. C. britannica, an inhabitant of coastal rock crevices, is similar.

Refs: Arup (2006), 8-9 (monochrome photos); Smith et al. (2009), 253; Dobson (2011), 104 (photo).


Caloplaca arcis
Caloplaca arcis
On church wall, Tuxford, Nottinghamshire, April 2012

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© A.J. Silverside
Uploaded May 2013, updated January 2016