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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.

Pyrrhospora quernea, showing C+ orange reaction
On bark, Pembroke, Pembrokeshire, May 2009, showing orange reaction with bleach (sodium hypochlorite)
Pyrrhospora quernea, thalli
Pyrrhospora quernea, closer view
Pyrrhospora quernea, with apothecia
On Sycamore (Acer pseudoplatanus), Craignethan, Lanarkshire, May 2012

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© A.J. Silverside
Uploaded June 2012, updated December 2013