• Acarospora impressula Th.Fr.
Acarospora impressula
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Look for this species on rocky, siliceous seacliffs squeezed between other lichens. It forms small streaks of red-brown thallus which appears cracked (like shattered glass) into tiny areoles (<2mm diam.) The areoles are spotted with dark brown dots which are the discs. Coastal, scattered in Ireland, probably under-recorded.

Key characteristics

  • Thallus red-brown, eye-catching, shattered into areoles like crazy paving
  • Often forming small streaks; always on siliceous rock.

Original text submitted by Vince J. Giavarini

 Simms, M. J., (2016). Acarospora impressula Th.Fr.. [In] LichenIreland. Accessed on 2018-07-16.