Arctoparmelia incurva (images of British lichens)

Thallus foliose, yellow to yellow-grey, lobes narrow, crowded, radiating, convex in cross section, turned under at the tips, pale brown beneath, inner lobes usually bearing large, globose, white to yellowish soralia; apothecia rare. On hard, exposed, base-poor rocks in the north and west, mainly upland.

Refs: Smith et al. (2009), 152; Purvis et al. (1992), 430 (as Parmelia); Dobson (2005), 64 (photo); Dobson (2011), 70 (photo); Jahns (1983), 196-7 (photo, as Parmelia); Moberg & Holmåson (1984), 90 (photo, as Parmelia); Nordic Lichen Flora (2011) 4: 20, 144 (photo); Wirth (1995), 2: 644, 645 (photo, as Parmelia); Hansen & Anderson (1995), 45 (photo); Hinds & Hinds (2007), 125 (photo); Lichen Atlas of the British Isles 1: 1000 (1995).

Digital photography and printing technology commonly do not reproduce the yellow colour of this lichen well. Compared with its field appearance, it is depicted too grey in the photograph below.

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Images of British Lichens