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Alan Silverside's Lichen Pages
Opegrapha calcarea Turner ex Sm.
Very variable, thallus thin, white or grey to pale pink or rust, usually more or less immersed in the substrate surface; fruitbodies initially as small, irregular, black crusts, opening as slit-like, lirellate apothecia. Part of a difficult group commonly requiring microscopic examination of the spores for accurate identification. Widespread, especially on coastal rocks and on base-rich or base-enriched rocks, mortar and cement inland.
Refs: Smith et al. (2009), 637; Purvis et al. (1992), 412 (as O. saxatilis); Dobson (2005), 293 (photo); Allen (2007), 32 (photo); van Herk & Aptroot (2004), 266-268 (photo); Wirth (1995), 2: 622; Puntillo (1996), plate 26 (photo).
Photograph: Arbroath, Angus, April 2002
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Uploaded April 2008, last modified June 2010 (first hosted at www-biol.paisley.ac.uk, January 2003)
