• Opegrapha rupestris Pers.
Opegrapha rupestris
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As suggested by the specific name, this lichen is rock-dwelling. It is in fact one of several Irish parasitic lichens. This species targets limestone lichens, especially Verrucaria which grow in pits embedded in the rock. The discs (lirellae: 0.2-0.3mm diam.) occur in small, scattered clusters and have three-septate spores. It occurs where Verrucaria grows on hard natural limestone as well as on limestone in churchyards and other local habitats. Northern and western Ireland.

Key characteristics

  • Parasitic mostly on pit-forming Verrucaria lichens
  • Thallus barely visible, discs tiny, superficial, three-septate.

Original text submitted by Vince J. Giavarini

 Simms, M. J., (2016). Opegrapha rupestris Pers.. [In] LichenIreland. Accessed on 2018-06-24.