• Farnoldia jurana (Schaer.) Hertel
Farnoldia jurana
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Where farmland gives way to landscapes of hard, damp limestone, this species should be searched for. The thallus is almost non-existent: just a smear of pale grey can be seen, but the discs (0.5-1.5mm diam.) are quite unlike anything else on limestone black, rounded in shape with a black raised rim but also with a small black spot, pip or distortion in the centre, like the middle of a wheel. You would have to be scanning the limestone rock surface with a lens to notice. Predominantly north-west Ireland especially The Burren.

Key characteristics

  • Black discs with a hard rim but also with a raised spot in the centre of some of the discs
  • Hard, damp limestones.

Original text submitted by Vince J. Giavarini

 Simms, M. J., (2016). Farnoldia jurana (Schaer.) Hertel. [In] LichenIreland. Accessed on 2018-08-16.