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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.
Original text submitted by Vince J. Giavarini
|Simms, M. J., (2016). Aspicilia calcarea (L.) Körb.. [In] LichenIreland. |
http://www.habitas.org.uk/lichenireland/species.asp?item=18182 Accessed on 2017-01-24.