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Images of British Lichens

Lecanora crenulata (Dicks.) Hook.

Thallus thin and disappearing or immersed, leaving apothecia mostly scattered on the substrate surface; apothecia small, usually <1mm diameter, with discs brown to blackish but thickly grey-pruinose, margins thick, somewhat inrolled, pruinose, neatly incised and crenulate. On limestone, lime-rich mortar and other calcareous substrates, widespread, common in the south, much more local in Scotland but still to be expected where suitable habitat exists.

Refs: Śliwa (2007), 24 (photo); Smith et al. (2009), 483; Purvis et al. (1992), 303; Dobson (2005), 219-20 (photo); Dobson (2011), 224-5 (photo); Wirth (1995), 1: 458, 471 (photo); Wirth, Hauck & Schulz (2013), 1: 586, 595 (photo); Schumm (2011), 225-9 (photos); van Herk & Aptroot (2004, 2013), 208-9 (photo); Thomson (1997), 276-8; Brodo et al. (2001), 381 (photo, as L. hagenii, fide Edwards et al. in Smith et al. (2009)).


Lecanora crenulata, close view
On limestone gravestone, Eriswell, Suffolk, April 2012
Lecanora crenulata
On limestone church wall, Alwalton, Huntingdonshire, April 2012 (disc colour showing through pruina, or perhaps parasitised?)
Lecanora crenulata, wet
Damp material after heavy rain, on ancient wall, Coity Castle, Glamorgan, February 2012 (BLS meeing)
Lecanora crenulata
On limestone church wall, Holme-next-the-sea, Norfolk, July 2009

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© A.J. Silverside
Uploaded August 2013, last updated January 2016