• Caloplaca crenulatella (Nyl.) H.Olivier
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Caloplaca crenulatella
© Mike Simms
Caloplaca crenulatella
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(Map updated: 11 August 2009)

In urban areas especially, this species is spreading to dominate old areas of concrete and mortar especially where flat and close to the ground, for example, below sea defences. The biggest spread in recent years has been across untreated, garden patios. From a standing position the species resembles the ubiquitous lichen Protoblastenia rupestris (described elsewhere) but close study shows this species to have flatter, more orange-yellow discs with a clear yellow margin and very different spores. North and south-west Ireland.

Key characteristics

  • On horizontal concrete and patio slabs; discs flat to slightly convex (very convex, lumpy or clustered in Protoblastenia rupestris)
  • Discs with a margin; colonies spreading across several centimetres.

Original text submitted by Vince J. Giavarini

 Simms, M. J., (2016). Caloplaca crenulatella (Nyl.) H.Olivier. [In] LichenIreland. Accessed on 2019-03-23.