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Images of British Lichens



Pleopsidium chlorophanum (Wahlenb.) Zopf


Thallus greenish- to bright yellow, crustose, areolate with rather smooth, convex areoles, margin placodioid; apothecia yellow with thalline margins but becoming immarginate, initially immersed, becoming flat to convex, clustered in the centre of the thallus. A circumpolar, arctic-alpine species of sheltered, base-poor rocks, recently discovered in very small quantity in at least two British sites, the locations not suggestive of a native or long-term distribution. This species is too rare to be collected.

Refs: Smith et al. (2009), 720; Purvis et al. (1992), 568 (as Acarospora chlorophana); Jahns (1983), 232-3 (photo, as A. chlorophana); Wirth (1995), 2: 751 (photo); Wirth, Hauck & Schulz (2013), 2: 901 (photo), 902; Moberg & Holmåson (1984), 163 (photo, as A. chlorophana); Holien & Tønsberg (2008), 183 (photo); Hansen & Andersen (1995), 75 (photo, but might be P. oxytona?); Thomson (1997), 20, 22 (photo, as A. chlorophana); Øvstedal & Smith (2001), 279, plate 67 (photo).

 
Pleopsidium chlorophanum
On drystone wall, near Braemar, Aberdeenshire, March 2008


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Uploaded June 2009, last updated September 2013