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Images of British Lichens



Lecanora muralis (Schreb.) Rabenh.


Thallus placodioid (a crust with a lobed, almost foliose margin), pale- to brownish cream, greenish-grey or grey; apothecia with yellow- to grey- or red-brown discs, often crowded and becoming angular. On natural, bird-enriched rocks, and on concrete and other urban substrates; widespread and becoming very common in urban areas, less so in the north and west. On paving slabs often assumed to be discarded and trodden chewing gum – see lower photographs (compare Aspicilia contorta).

Refs: Smith et al. (2009), 491; Purvis et al. (1992), 309; Dobson (2005), 211-212 (photo); Dobson (2011), 217 (photo); Jahns (1983), 206-7 (photo); Fox et al. (2003), plate 8 (photo); Whelan (2011), 105 (photo); van Herk & Aptroot (2004, 2013), 214-215 (photo); Wirth (1995), 1: 452-453 (photo); Wirth et al. (2004), 189 (photo); Wirth, Hauck & Schulz (2013), 1: 561, 604 (photos); Moberg & Holmåson (1984), 117 (photo); Holien & Tønsberg (2008), 184 (photo, as Protoparmeliopsis muralis); Stenroos et al. (2011), 381 (photo, as Protoparmeliopsis muralis); Hansen & Anderson (1995), 95 (photo); Valcárcel et al. (2003), 216-7 (photo); Puntillo (1996), plate 22 (photo); Brodo et al. (2001), 383 (photo); Thomson (1997), 295, 296 (photo).

FGBI: http://fungi.myspecies.info/all-fungi/lecanora-muralis

 
Lecanora muralis
Lecanora muralis, enlarged
On concrete, Wicken Fen, Cambridgeshire, April 2006
 
Lecanora muralis on paving stones, resembling discarded chewing gum
Lecanora muralis on paving stones, closer view
On pavement, patches resembling discarded chewing gum, Ely, Cambridgeshire, April 2007


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© A.J. Silverside
Uploaded March 2008, last updated January 2016 (first hosted at www-biol.paisley.ac.uk, May 2006)