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Images of British Lichens

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Solenopsora candicans (Dicks.) J.Steiner

Thallus placodioid with shortly radiating, irregular marginal lobes, white to pale grey, thickly white-pruinose, lacking soredia or isidia; apothecia with blue-black discs and white, thalline rims. On hard limestone rocks, gravestones and monuments, widespread in England and Wales but rare in Scotland. Refs: Smith et al. (2009), 842; Purvis et al. (1992), 565; Dobson (2005), 406 (photo); Dobson (2011), 411, 412 (photo); Jahns (1983), 204-5 (photo); Wirth (1995), 2: 857 (photo). Compare Rhizocarpon umbilicatum, in which the apothecia have pruinose rims, but lack the defined, white, thalline margins of S. candicans.

 

On coastal limestone cliffs, Stackpole, Pembrokeshire, May 2009

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© A.J. Silverside
Uploaded July 2012, last updated September 2012