Images of British Lichens
Opegrapha lithyrga Ach.
Thallus very thin, grey to green or brown, lacking soredia, sometimes in mosaics with other species; apothecia black, lirellate, rounded or ellipsoid to elongate and sinuous, ascospores 5-7 septate, 20-35 × 3-5 µm (dimensions from Pentecost & James, in Smith et al., 2009). On sheltered, shaded, siliceous and ultrabasic rocks, often under overhangs, mainly in the west.
Refs: Smith et al. (2009), 640; Purvis et al. (1992), 409; Valcárcel et al. (2003), 260-1 (photo); Puntillo (1996), plate 27 (photo).
|On shaded rockface under overhang, Isle of Muck, June 2012 (BLS meeting)|
|On shaded basalt rockface under overhang, Traprain Law, East Lothian, June 2011|
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uploaded February 2014