• Rhizocarpon polycarpon (Hepp) Th.Fr.
Rhizocarpon polycarpon
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This crustose, ‘brown Rhizocarpon’ has persistently colourless, one-septate spores, and medulla I+ blue. The epithecium is K+ purple-red and thallus C-. It is a species of hard acid rocks, especially those of mountain slopes. It is poorly recorded in Ireland, with very few records.

Key characteristics

  • Thallus brown, areolate: C-, medulla I+ blue; spores: one-septate, colourless
  • Epithecium K+ purple-red; siliceous rock – upland and coastal.

Original text submitted by Vince J. Giavarini

 Simms, M. J., (2016). Rhizocarpon polycarpon (Hepp) Th.Fr.. [In] LichenIreland. Accessed on 2018-08-17.