• Opegrapha parasitica (A.Massal.) H.Olivier
Opegrapha parasitica
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(Map updated: 11 August 2009)

As its name implies this ‘scripture lichen’ is parasitic. It invades the thallus of both Aspicilia calcarea and A. contorta. The small, black, snaky, elongated discs (lirellae) are easy to see. It should not be confused with O. rupestris which grows mostly on Verrucaria species. Northern and central Ireland. It is absent from the south.

Key characteristics

  • Parasitic on the thallus of Aspicilia calcarea and A. contorta
  • Thin black discs (lirellae), singly or thinly scattered, not clustered.

Original text submitted by Vince J. Giavarini

 Simms, M. J., (2016). Opegrapha parasitica (A.Massal.) H.Olivier. [In] LichenIreland. Accessed on 2019-01-20.