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Buellia griseovirens (Turner & Borrer ex Sm.) Almb.


Thallus crustose, variable, immersed in the substrate or thin and effuse to moderately thick, white to grey, or tinged greenish or brownish, smooth or cracked, usually with abundant, discrete, yellow-green to blue-green or grey (scratching yellow) soralia that become confluent on the thallus surface, thallus often bounded by a dark grey to black prothallus; apothecia very rare, black, lecideine, not set into the thallus surface, ascospores brown, 3-septate or with an additional lengthwise septum (submuriform). Widespread and often common on bark, also on worked wood and said to occur on brick.

Refs: Bungartz et al. (2007), 145; Smith et al. (2009), 234; Purvis et al. (1992), 133; Dobson (2005), 88 (photo); Dobson (2011), 96 (photo); van Herk & Aptroot (2004, 2013), 84-5 (photo); van Haluwyn et al. (2009), 158-9 (photo); Wirth (1995), 1: 192, 193 (photo); Wirth, Hauck & Schulz (2013), 1: 246 (photo); Holien & Tønsberg (2008), 155 (photo); Nordic Lichen Flora (2002) 2: 19, 92 (photo).

Buellia griseovirens
Buellia griseovirens
Buellia griseovirens, closer view
On trunk of old Beech (Fagus silvatica) in private garden, Gleniffer Braes, Renfrewshire, April 2011


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Uploaded April 2013, last updated December 2013