• Aspicilia calcarea (L.) Körb.
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Aspicilia calcarea
© Mike Simms
Aspicilia calcarea
© Mike Simms
Aspicilia calcarea
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This is one of the first lichens the beginner will notice on walls of limestone rock. The thallus forms flat, smooth, light grey patches, strongly zoned towards the edge. It can dominate rock surfaces, often turning considerable areas white. On close inspection, the surface will be seen to be minutely cracked into areoles (little ‘island’ pieces of thallus) in which the small, angular discs are immersed.

Key characteristics

  • Forms white patches on calcareous rocks and walls
  • Immersed discs sharply angular, the thallus zoned at the edge.

Original text submitted by Vince J. Giavarini

 Simms, M. J., (2016). Aspicilia calcarea (L.) Körb.. [In] LichenIreland. Accessed on 2018-08-15.