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Images of British Lichens

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 irregularly nodular to slit-like, branched or stellate, lirellate apothecia. Part of a difficult group commonly requiring microscopic examination of the spores for accurate identification, ascospores 3-septate, narrowly club-shaped, 16-20(-24) × 4.5(-6.5) µm (dimensions from Pentecost & James, in Smith et al., 2009). 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); Dobson (2011), 296 (photo); Allen (2007), 32 (photo); Whelan (2011), 119 (photo); van Herk & Aptroot (2004, 2013), 266-268 (photo); Wirth (1995), 2: 622; Wirth et al. (2004), 264 (photo); Puntillo (1996), plate 26 (photo).

Opegrapha calcarea
On church wall, Winterton, Norfolk, January 2010 (BLS meeting)
Opegrapha calcarea
On church wall, Holme-next-the-Sea, Norfolk, July 2009
Opegrapha calcarea
Opegrapha calcarea, enlarged view
On coastal rockface, Arbroath, Angus, April 2002 (det. B.J. Coppins)

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© A.J. Silverside
Uploaded April 2008, last updated February 2014 (first hosted at, January 2003)