Images of British Lichens
Pyrrhospora quernea (Dicks.) Körb.
Thallus a cracked, buff, granular sorediate crust, commonly delimited by a very narrow black line, reacting orange with bleach (sodium hypochlorite); apothecia infrequent, irregular and (as described by Dobson) appearing as if melting, red-brown. Widespread and locally frequent on rough bark.
Refs: Refs: Smith et al. (2009), 780; Purvis et al. (1992), 523; Dobson (2005), 379 (photo); Dobson (2011), 382 (photo); Whelan (2011), 136 (photo); van Herk & Aptroot (2004, 2013), 332-3 (photo, printed with green colour cast in my copy); van Haluwyn et al. (2009), 150-1 (photo); Frahm et al. (2010), 52 (photo); Brodo et al. (2001), 615 (photo).
Lecanora expallens is similar and also reacts orange with bleach, but is green rather than buff, gives a yellow reaction with KOH and lacks a delimiting fine, black line; L. compallens lacks the bleach reaction.
|On bark, Pembroke, Pembrokeshire, May 2009, showing orange reaction with bleach (sodium hypochlorite)|
|On Sycamore (Acer pseudoplatanus), Craignethan, Lanarkshire, May 2012|
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Uploaded June 2012, updated December 2013