• Caloplaca arenaria (Pers.) Müll.Arg.
Caloplaca arenaria
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Sometimes confused with C. ceracea and C. crenularia, C. arenaria grows on nutrient-rich siliceous rocks, especially slate and basalt, frequently spreading over other lichens. This species has an immersed thallus, small, red-orange, flat-shaped discs with a persistent proper margin. In Ireland: Counties Cork and Antrim only.

Key characteristics

  • Thallus, not obvious; discs, small, red-orange, spreading to other lichens; spore septum narrow
  • On nutrient-rich, siliceous rock, especially basalt and slate.

Original text submitted by Vince J. Giavarini

 Simms, M. J., (2016). Caloplaca arenaria (Pers.) Müll.Arg.. [In] LichenIreland. Accessed on 2018-07-23.