• Cecidonia umbonella (Nyl.) Triebel & Rambold 

There are no records for this species at present.

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This lichenicolous species (thallus K+ yellow to red) usually occurs as warts on the thallus of Lecidea lapicida. It forms white, convex, gall-like nodules with black discs peppering the surface, like spots on a ladybird. Close attention to the discs will show they have a plug of tissue (an umbo) at the centre. In Ireland, it is known from Counties Kerry (south), Sligo and Londonderry.

Key characteristics

  • Wart-like on Lecidea lapicida, thallus white, K+ yellow-red
  • Discs black, with an umbo developing at maturity.

Original text submitted by Vince J. Giavarini

 Simms, M. J., (2016). Cecidonia umbonella (Nyl.) Triebel & Rambold . [In] LichenIreland. Accessed on 2018-08-16.