• Opegrapha saxigena Taylor
Opegrapha saxigena
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This dark-brown to purple-brown ‘scribble-lichen’ seeks out the most deeply shaded acid (siliceous) rocks in steep, rocky woodland where it occurs alongside other shade-seekers such as O. gyrocarpa and O. zonata. O. saxigena is non-sorediate with short, squat, slit-like discs (0.5-1.2mm diam.) and three-septate spores. Extreme western Ireland.

Key characteristics

  • Brown thallus and short discs (lirellae) with slit barely exposed; three-septate spores
  • On shaded acid rocks in wooded valleys, never on limestone.

Original text submitted by Vince J. Giavarini

 Simms, M. J., (2016). Opegrapha saxigena Taylor. [In] LichenIreland. Accessed on 2018-08-17.