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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 initially as small, elliptical to irregular, circular-folded to longitudinally furrowed black crusts, opening as slit-like, lirellate apothecia. Best confirmed by microscopic examination of the spores. 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; Wirth (1995), 2: 622, 627 (photo); Puntillo (1996), plate 26 (photo).
Photograph: Schiehallion, Perthshire, April 2003
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Uploaded April 2008, last modified June 2010
