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Alan Silverside's Lichen Pages
Ochrolechia androgyna (Hoffm.) Arnold
Thallus crustose, thin to rather thick and warted, pale grey or tinged with yellow, with abundant whitish to pale grey to buff or greenish soralia usually covering much of the surface; apothecia with thick, often sorediate margins and yellow-brown disks. Widespread on base-poor rocks and acid tree bark. Variable; recent Scandinavian work suggests this may be a complex of more than one species.
Refs: Smith et al. (2009), 628; Purvis et al. (1992), 398; Dobson (2005), 283 (photo); van Herk & Aptroot (2004), 262-263 (photo); Wirth (1995), 2: 611 (photo), 612; Moberg & Holmåson (1984), 206 (photo); Holien & Tønsberg (2008), 175 (photo); Brodo et al. (2001), 465 (photo); Thomson (1997), 429, 430 (photo).
saxicolous: Braemar, Aberdeenshire, March 2008
lignicolous: on old wooden fence-post, Kindrogan, Perthshire, March 2008,
showing orange-red reaction with sodium hypochlorite (bleach)
corticolous: on tree trunk, Kindrogan, Perthshire, April 2003, rubbish photograph but showing apothecia
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© A.J. Silverside
Uploaded April 2008, last modified June 2010 (first hosted at www-biol.paisley.ac.uk, January 2003)
