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Images of British Lichens



Xanthoparmelia conspersa (Ehrh. ex Ach.) Hale
 
(= Parmelia conspersa (Ehrh. ex Ach.) Ach.)


Thallus foliose, green-grey or distinctly yellow-grey (but commonly appearing pure grey in digital photographs or with digital printing technology), smooth and somewhat glossy, with usually numerous peg-like isidia on the older lobe surfaces, lower surface black; apothecia frequent, conspicuous, to 1cm in diameter, with red-brown discs and pale, often undulate, crenulate margins. Locally common, especially in the north and west, on exposed, base-poor rocks.

Refs: Smith et al. (2009), 964; Purvis et al. (1992), 429 (as Parmelia); Dobson (2005), 459-60 (photo); Dobson (2011), 467-8 (photo); Jahns (1983), 194-5 (photo, as Parmelia); Allen (2007), 18 & 26 (photos); Fox, Guest & Harmer (2003), plate 2 (photo); van Herk & Aptroot (2004, 2013), 292-3 (photo); Hansen & Anderson (1995), 44 (photo); Moberg & Holmåson (1984), 88 (photo, as Parmelia); Holien & Tønsberg (2008), 60 (photo); Nordic Lichen Flora (2011) 4: 132, 172 (photo); Stenroos et al. (2011), 494 (photo); Wirth (1995), 2: 639 (photo, as Parmelia), 644; Wirth et al. (2004), 146 (photo, as Parmelia); Wirth, Hauck & Schulz (2013), 2: 1182, 1183 (photo); Valcárcel et al. (2003), 268-9 (photo, as Parmelia); Brodo et al. (2001), 735, 736 (photo); Hinds & Hinds (2007), 519 (photo); Lichen Atlas of the British Isles 1: 988 (1995) (as Parmelia).

Xanthoparmelia conspersa
On base-poor rock in moorland, Dartmoor, Devon, August 2008
 
Xanthoparmelia conspersa
On base-poor boulder, Aberfoyle, Sirlingshire, March 2009
 
Xanthoparmelia conspersa
On basalt rocks, Traprain Law, East Lothian, June 2011 (yellow colour lost)
 
Xanthoparmelia conspersa
Xanthoparmelia conspersa
Xanthoparmelia conspersa, close view
Xanthoparmelia conspersa, habitat
On base-poor rocks on loch shore, Loch Lomond, Stirlingshire, May 2010, in sun and shade (yellow colour lost)
 
Xanthoparmelia conspersa
Xanthoparmelia conspersa
Greenish-grey variant, on glacial erratic granite boulder, Shap, Westmorland, April 2012


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© A.J. Silverside
Uploaded May 2012, updated December 2013