• Arthonia thelotrematis Coppins
Arthonia thelotrematis
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(Map updated: 11 August 2009)

This species grows only on the thallus of Thelotrema lepidinum on hazel. Small dark patches are the first clue as to its presence. Black discs of various rounded shapes occur sprinkled across the surface containing mostly three-septate spores (1114m long), these with an enlarged upper cell. In Ireland, it is known from Counties Sligo, east Donegal and Fermanagh.

Key characteristics

  • Thallus darker than the host with small, black rounded or elongated discs; spores two- or three-septate with an enlarged upper cell
  • On Thelotrema lepidinum on hazel.

Original text submitted by Vince J. Giavarini

 Simms, M. J., (2016). Arthonia thelotrematis Coppins. [In] LichenIreland. Accessed on 2020-05-30.