LichenIreland
  • Caloplaca chalybaea (Fr.) Müll.Arg.
Caloplaca chalybaea
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This Caloplaca is one of the grey thallus tribe with black discs. Its appearance is more that of an Aspicilia. The thallus can be large or very small and has a zoned margin limited by a black line. The small black discs that are immersed at first can be hazy blue-grey frosted. The spore septum is about one-third the length of the spore. It grows on hard limestones. C. variabilis has a thinner, darker grey thallus with black sessile discs. In Ireland, there is a good range of records from the north-east and south-west.

Key characteristics

  • Thick, pale grey thallus, discs black, immersed at first, very like an Aspicilia
  • Hard limestones and boulders.

Original text submitted by Vince J. Giavarini

 Simms, M. J., (2016). Caloplaca chalybaea (Fr.) Müll.Arg.. [In] LichenIreland.
http://www.habitas.org.uk/lichenireland/species.asp?item=20521 Accessed on 2017-11-23.