• Caloplaca cirrochroa (Ach.) Th.Fr.
Caloplaca cirrochroa
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(Map updated: 11 August 2009)

Most Caloplaca taxa are distinguished by a bright orange, crustose thallus. C. cirrochroa is no exception and on close study turns out to be one of the most beautiful examples of the family, forming circular thalli (1-2cm diam.) of narrow, radiating lobes to the rear of which are scattered, bright orange or lemon-yellow spots of convex soralia. The species is local, sometimes locally abundant, on hard, dry, sheltered, vertical limestone undisturbed headstones especially. Throughout Ireland.

Key characteristics

  • Orange circular thalli with an outer ring of radiating lobes surrounding an inner area spotted with bright orange or pale, lemon-yellow soredia
  • On hard limestones in warm, sheltered localities.

Original text submitted by Vince J. Giavarini

 Simms, M. J., (2016). Caloplaca cirrochroa (Ach.) Th.Fr.. [In] LichenIreland. Accessed on 2019-01-19.