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Images of British Lichens



Peltigera horizontalis (Huds.) Baumg.


Lobes rather broad, upper surface of fresh thallus brown to brown- or blue-grey, much darker when dry, smooth, lustrous; lower surface white, with very dark, anastomosing veins and fasciculate, pale to dark rhizines; apothecia rounded, with flattened discs, held horizontally. On mossy trunks, stumps and rocks, widespread but mainly in the north and west, in old forest.

Refs: Smith et al. (2009), 669; Purvis et al. (1992), 446; Dobson (2005), 317 (photo); Dobson (2011), 317-8 (photo); Jahns (1983), 238-239 (photo); Whelan (2011), 125 (photo); Wirth (1995), 2: 678, 683 (photo); Wirth et al. (2004), 164 (photo); Wirth, Hauck & Schulz (2013), 2: 826, 831 (photo); Nordic Lichen Flora (2007) 3: 119, 194 (photo); Moberg & Holmåson (1984), 175 (photo); Holien & Tønsberg (2008), 123 (photo); Stenroos et al. (2011), 47 & 322 (photos); Brodo et al. (2001), 510 (photo); Hinds & Hinds (2007), 364-5 (photo); Vitikainen (1994) 45-47 (photo).

Peltigera horizontalis
Peltigera horizontalis, closer view
Om mossy trunk of Lime (Tilia x europaea), Ardanaiseig, Argyllshire, December 2009
 
Peltigera horizontalis
Glen Tilt, Perthshire, April 2008
 
Peltigera horizontalis
On old tree-base, Taymouth, Perthshire, April 2002 (some P. membranacea also present)


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© A.J. Silverside
Uploaded May 2008, last updated September 2013 (first hosted at www-biol.paisley.ac.uk, January 2003)