• Pertusaria melanochlora (DC.) Nyl.
Pertusaria melanochlora
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This rare, crustose species is most likely to be found on large, stable, acid or intermediate boulders (for example, schistose rocks) along fast-flowing, upland streams. The thick, dark grey thallus is often accompanied by gross, cylindrical warts (to 2mm thick), sometimes clustered, sometimes eroded or appearing ground-down to form coarse soredia. Mountain streams in Counties Kerry and Waterford. Look for it on minibus-sized boulders.

Key characteristics

  • Thallus crustose, grey to dark grey; with stubby, crowded or not cylindrical, pale-tipped warts (papillae); often forming large patches
  • KC+ violet thallus separates it from lookalikes.

Original text submitted by Vince J. Giavarini

 Simms, M. J., (2016). Pertusaria melanochlora (DC.) Nyl.. [In] LichenIreland. Accessed on 2018-08-17.