• Caloplaca dalmatica (A.Massal.) H.Olivier
Caloplaca dalmatica
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(Map updated: 11 August 2009)

A pioneer species of well-lit, smooth, vertical limestone, C. dalmatica has a pale yellowy-orange, glazed thallus forming dense patches (sometimes mosaics), minutely cracked into areoles (little islands of thallus like jigsaw pieces). Usually, it is abundantly fertile, the small, orange discs (to 1mm diam.) darker than the thallus. Scattered; throughout Ireland.

Key characteristics

  • The relatively thick, glazed, often sickly, yellow-orange, mosaic-forming, minutely cracked thallus should distinguish it. Generally it associates with species-poor communities containing, for example, Diplotomma alboatrum
  • It is not to be confused with C. ochracea which is a more substantial lichen with a thinner thallus packed with discs and associated with rich lichen communities on natural limestone.

Original text submitted by Vince J. Giavarini

 Simms, M. J., (2016). Caloplaca dalmatica (A.Massal.) H.Olivier. [In] LichenIreland. Accessed on 2019-01-16.