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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.

Xanthoparmelia mougeotii
Xanthoparmelia mougeotii, close view showing soralia
Xanthoparmelia mougeotii, enlarged view showing apothecia
Xanthoparmelia mougeotii
On gravestone, Ardclach, Morayshire, August 2010
Xanthoparmelia mougeotii
Xanthoparmelia mougeotii, enlarged
Xanthoparmelia mougeotii
On pebbles in exposed, acid dune system, Findhorn, Morayshire, August 2010
Xanthoparmelia mougeotii
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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© A.J. Silverside
Uploaded May 2012; updated December 2013