• Arthonia galactites (DC.) Dufour
Arthonia galactites
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Now extinct in Ireland this is a species faithful to poplar trees. The white, K+ faint yellow thallus forms small wheel-like patches with scattered flat black, non-pruinose discs. The spores (1214 x 45) are one-septate, hymenium K+ violet.

Key characteristics

  • Thallus forming round patches, snow white K+ faint yellow; discs black
  • Spores one-septate, hymenium with coloured pigments, K+ violet.

Original text submitted by Vince J. Giavarini

 Simms, M. J., (2016). Arthonia galactites (DC.) Dufour. [In] LichenIreland. Accessed on 2018-08-17.