Images of British Lichens
Buellia ocellata (Flot.) Körb.
Thallus crustose, areolate, variable, pale or greenish grey to greyish yellow, usually bounded by a black prothallus which is also visible between the areoles, and which on open surfaces is fimbriate at the margins, thallus testing negative with potassium hydroxide (K-), reacting orange with bleach, sodium hypochlorite (C+); apothecia black, lecideine, set down in the areoles (innate), with margins thin and usually inconspicuous, often a single, round apothecium occupies most of the areole, giving an eye-like appearance, ascospores brown, 1-septate. Widespread but much more common in the south, often within lichen mosaics, a colonist on nutrient-poor rocks and shingle.
Refs: Smith et al. (2009), 235; Purvis et al. (1992), 134; Dobson (2005), 89 (photo); Dobson (2011), 97 (photo); van Herk & Aptroot (2004, 2013), 84-5 (photo); Wirth, Hauck & Schulz (2013), 1: 243 (photo), 248; Nordic Lichen Flora (2002) 2: 20, 93 (photo).
|On gravestone, Slapton, South Devon, August 2011|
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Uploaded April 2013, last updated January 2016