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Images of British Lichens

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); Wirth, Hauck & Schulz (2013), 2: 1043 (photo).

Compare Rhizocarpon umbilicatum, in which the apothecia have pruinose rims, but lack the defined, white, thalline margins of S. candicans.

Solenopsora candicans
On limestone rocks, Ingleton, Yorkshire, July 2013
Solenopsora candicans
On coastal limestone cliffs, Stackpole, Pembrokeshire, May 2009

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© A.J. Silverside
Uploaded July 2012, last updated September 2013