Images of British Lichens
Trapeliopsis flexuosa (Fr.) Coppins & P.James
Thallus a thick crust, consisting of rather obscurely delimited, tiny, cushion-like, granular areoles, pale- or blue-grey to blue-green, usually densely covered by coalescent, grey-green to blue-green soralia, thallus testing red with sodium hypochlorite (bleach); apothecia green-black to black, rarely paler or pinkish in shade (Purvis et al.). Widespread and often common, especially on old, worked wood.
Refs: Coppins & James (1984); Smith et al. (2009), 908; Purvis et al. (1992), 613; Dobson (2005), 432 (photo); Dobson (2011), 439 (photo); Whelan (2011), 146 (photo); van Herk & Aptroot (2004, 2013), 368-9 (photo); Frahm et al. (2010), 52-3 (photo); Wirth, Hauck & Schulz (2013), 2: 1111, 1114 (photo); Brodo et al. (2001), 686 (photo); Thomson (1997), 622, 623 (photo).
|On old wooden bench, Wicken Fen, Cambridgeshire, April 2006|
|Greyer variant in close view, on old wooden fence, Kindrogan, Perthshire, March 2008|
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Uploaded January 2009, last updated January 2016