Images of British Lichens
Xanthoparmelia mougeotii (Schaer. ex D.Dietr.) Hale
(= Parmelia mougeotii Schaer. ex D.Dietr.)
Thallus foliose, green-grey or distinctly yellow-grey (but commonly appearing pure grey in digital photographs or with digital printing technology), lobes radiating, usually narrow and somewhat serpentine, often convex in cross-section or flattened at the tips, cracked and brown in the centre part of the thallus, with subglobose yellow to grey-yellow soralia on the lobe surfaces, lower surface black; apothecia small, with brown discs and pale, crenulate margins, said to be rare. Widespread and locally common on exposed, base-poor rocks and gravestones, able to colonise various man-made surfaces.
Refs: Smith et al. (2009), 965; Purvis et al. (1992), 429 (as Parmelia); Dobson (2005), 460 (photo); Dobson (2011), 469 (photo); Jahns (1983), 194-5 (photo, as Parmelia); Fox, Guest & Harmer (2003), plate 6 (photo); van Herk & Aptroot (2004, 2013), 294-5 (photo); Valcárcel et al. (2003), 272-3 (photo, as Parmelia); Nordic Lichen Flora (2011) 4: 134, 173 (photo); Stenroos et al. (2011), 497 (photo); Wirth (1995), 2: 644, 668 (photo, as Parmelia); Wirth, Hauck & Schulz (2013), 2: 1184 (photo); Lichen Atlas of the British Isles 1: 1005 (1995) (as Parmelia).
Arctoparmelia incurva could be confused with this species but has more crowded, uniformly convex lobes, turning under at the tips.
|On gravestone, Ardclach, Morayshire, August 2010|
|On pebbles in exposed, acid dune system, Findhorn, Morayshire, August 2010|
|On base-poor boulder, Aberfoyle, Stirlingshire, March 2009, soredia somewhat water-soaked after rain, yellowish tints in thallus lobes not shown in photo|
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Uploaded May 2012; updated December 2013