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Images of British Lichens

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 discs. Widespread on base-poor rocks and acid tree bark. Variable; recent Scandinavian work suggests this may be a complex of more than one species. Compare Trapelia placodioides.

Refs: Smith et al. (2009), 628; Purvis et al. (1992), 398; Dobson (2005), 283 (photo); Dobson (2011), 288 (photo); Whelan (2011), 118 (photo); van Haluwyn et al. (2009), 160-1 (photo); van Herk & Aptroot (2004, 2013), 262-263 (photo); Wirth (1995), 2: 611 (photo), 612; Wirth, Hauck & Schulz (2013), 2: 781 (photos), 838, 843; Frahm et al. (2010), 92-3 (photo); Moberg & Holmåson (1984), 206 (photo); Holien & Tønsberg (2008), 175 (photo); Stenroos et al. (2011), 297 (photo); Valcárcel et al. (2003), 254-5 (photo); Brodo et al. (2001), 465 (photo); Thomson (1997), 429, 430 (photo).

Ochrolechia androgyna on rock face
Ochrolechia androgyna on rock face, close view showing soralia
saxicolous: Braemar, Aberdeenshire, March 2008
Ochrolechia androgyna on old wooden fence-post, close view showing soralia
lignicolous: on old wooden fence-post, Kindrogan, Perthshire, March 2008,
showing orange-red reaction with sodium hypochlorite (bleach)
Ochrolechia androgyna on tree trunk, close-up showing apothecia and soralia
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 or updated April 2014 (first hosted at, January 2003)