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Images of British Lichens

Opegrapha dolomitica (Arnold) Clauzade & Cl.Roux

Thallus thin, white or grey to brown-red, scratching yellow, often more or less immersed in the substrate surface; fruitbodies black, initially small, elliptical to irregular, circular-folded to longitudinally furrowed, opening as slit-like, lirellate apothecia. Best confirmed by microscopic examination of the spores, ascospores 3-septate, narrowly club-shaped, (20-)22-26(-31) × 5-8 µm (dimensions from Pentecost & James, in Smith et al., 2009). Widespread but local on damp, base-rich rocks.

Refs: Smith et al. (2009), 638; Purvis et al. (1992), 412 (as O. saxicola); Dobson (2005), 294; Dobson (2011), 297; Wirth (1995), 2: 622, 627 (photo); Wirth, Hauck & Schulz (2013), 2: 787 (photo), 789; Puntillo (1996), plate 26 (photo).

Opegrapha dolomitica on limestone rockface
Opegrapha dolomitica on limestone rockface
On limestone rockface, Schiehallion, Perthshire, April 2003

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© A.J. Silverside
Uploaded April 2008, last updated February 2014