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Peltigera praetextata (Flörke ex Sommerf.) Zopf
Upper surface of fresh thallus brown to brown-grey, felted-tomentose at least at the margins, bullate, margins of older thalli isidiate, often also with groups of laminar isidia (but isidia may be lacking from lobes with apothecia); lower surface white-tomentose, with unbranched rhizines. The only common British Peltigera with isidia, but compare P. collina with marginal soredia. When drying, this species can easily be overlooked as P. membranacea, but is readily distinguished by the isidiate margins. Widespread and locally common on mossy boulders, tree-bases and on damp, heathy banks.
Refs: Smith et al. (2009), 671; Purvis et al. (1992), 443; Dobson (2005), 319 (photo); Jahns (1983), 240-241 (photo); Nordic Lichen Flora (2007) 3: 126, 198 (photo); Moberg & Holmåson (1984), 177 (photo); Holien & Tønsberg (2008), 122 (photo); Wirth (1995), 2: 680, 689 (photo); Brodo et al. (2001), 518-519 (photo); Hinds & Hinds (2007), 371-2 (photo); Vitikainen (1994) 74-77 (photo).
On mossy rocks, Glen Tilt, Perthshire, April 2008
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Uploaded May 2008, last modified June 2010
