• Buellia subdisciformis (Leight.) Jatta
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Buellia subdisciformis
© Mike Simms
Buellia subdisciformis
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(Map updated: 11 August 2009)

This is a common crustose lichen of siliceous maritime rocks. It can form tremendous colonies with sea-ivory, Ramalina siliquosa (described elsewhere) along exposed sea cliffs. The finely cracked, white to grey thallus bordered by a black line, supports abundant black discs (to 1.5mm diam.) with a conspicuous white-frosted margin. Spores are one-septate. Spot tests: K+ yellow-red, Pd+ yellow. Throughout Ireland.

Key characteristics

  • Very common with a white to grey thallus, black discs and frosted margin frequently in the sea-ivory zone
  • Reacts K+ yellow-red, C-, Pd+ yellow.

Original text submitted by Vince J. Giavarini

 Simms, M. J., (2016). Buellia subdisciformis (Leight.) Jatta. [In] LichenIreland. Accessed on 2019-08-25.