Images of British Lichens
Lecanora expallens Ach.
Thallus grey-green to yellow-green, becoming powdery sorediate to the thallus margins, testing deep yellow to red with sodium hypochlorite (bleach), apothecia rare. Common on stumps, decorticated wood and old, worked timber, sometimes on walls.
Refs: Smith et al. (2009), 485; Purvis et al. (1992), 305; Dobson (2005), 221-222 (photo); Dobson (2011), 226 (photo); van Haluwyn et al. (2009), 150-1 (photo); Wirth (1995), 1: 460, 474 (photo); Wirth et al. (2004), 296 (photo); Wirth, Hauck & Schulz (2013), 1: 121 (photo); Frahm et al. (2010), 42 (photo); van Herk & Aptroot (2004, 2013), 210-211 (photo); Valcárcel et al. (2003), 212-3 (photo); Thomson (1997), 280 (photo), 281.
L. compallens is closely similar but scratches white and tests negative with sodium hypochlorite. Compare also Lecanora jamesii and Loxospora elatina.
|On Sycamore (Acer pseudoplatanus) trunk, Finlaystone, Renfrewshire, February 2011, showing red reaction with bleach (sodium hypochlorite)|
|On Oak (Quercus) bark, Logie, Morayshire, August 2009|
|Arbroath, Angus, April 2002, on old wooden bench, with Buellia griseovirens (left) and L. chlarotera (right, with apothecia)|
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© A.J. Silverside
Uploaded March 2008, last updated December 2013 (first hosted at www-biol.paisley.ac.uk, January 2003)