LichenIreland
  • Cecidonia xenophana (Körb.) Triebel & Rambold
Cecidonia xenophana
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This lichenicolous species is easily told from its host Porpidia spp., and principally P. contraponenda. The whitish thallus supports abundant black discs (0.2-0.3mm diam.), some, but not all, with a central umbo. All spot test reactions are negative. In Ireland, the species is local; County Mayo northwards.

Key characteristics

  • Whitish thallus developed on Porpidia species in upland areas
  • Discs small, black, some with a central umbo; spot tests negative.

Original text submitted by Vince J. Giavarini

 Simms, M. J., (2016). Cecidonia xenophana (Körb.) Triebel & Rambold. [In] LichenIreland.
http://www.habitas.org.uk/lichenireland/species.asp?item=18734 Accessed on 2017-11-23.