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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.

Lecanora expallens
Lecanora expallens
On Sycamore (Acer pseudoplatanus) trunk, Finlaystone, Renfrewshire, February 2011, showing red reaction with bleach (sodium hypochlorite)
Lecanora expallens
On Oak (Quercus) bark, Logie, Morayshire, August 2009
Lecanora expallens
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, January 2003)