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Parmeliopsis ambigua (Wulfen) Nyl.
A neat little lichen, lobes flat, adpressed, usually radiating, approx. 1mm wide, yellow-green, lustrous, usually with rather conspicuous, flat to convex, laminar soralia. Primarily a species of conifer wood in central and eastern Scotland, that became much more widespread and more general on acidified substrates as a result of sulphur dioxide pollution, but now contracting in range as SO2 levels have dropped.
Refs: Smith et al. (2009), 660; Purvis et al. (1992), 250 (as Foraminella ambigua); Dobson (2005), 308-309 (photo); Jahns (1983), 204-5 (photo); van Herk & Aptroot (2004), 280-281 (photo); Hansen & Anderson (1995), 47 (photo); Wirth (1995), 2: 671-672 (photo); Moberg & Holmåson (1984), 98 (photo); Holien & Tønsberg (2008), 61 (photo); Pope (2005), 36 (photo); Brodo et al. (2001), 489 (photo).
On trunk of Scots Pine (Pinus sylvestris), Balmaha, Stirlingshire, November 2008
On trunk of Scots Pine (Pinus sylvestris), Braemar, Aberdeenshire, April 2003
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Uploaded April 2008, last modified June 2010
