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Peltigera praetextata (Flörke ex Sommerf.) Zopf


Upper surface of fresh thallus tan to brown-grey or brownish black, minutely felted-tomentose at least at the margins but tomentum usually invisible when wet, bullately wrinkled, margins of older thalli isidiate, often also with groups of laminar isidia (but isidia may be lacking from younger lobes or those with with apothecia); lower surface white-tomentose, with unbranched rhizines.

Refs: Vitikainen (1994) 74-77 (photo); Smith et al. (2009), 671; Purvis et al. (1992), 443; Dobson (2005), 319 (photo); Dobson (2011), 320 (photo); Jahns (1983), 240-241 (photo); Aptroot et al. (2011), 148-9 (photos); Nordic Lichen Flora (2007) 3: 126, 198 (photo); van Haluwyn et al. (2009), 69-9 (photos); Moberg & Holmåson (1984), 177 (photo); Holien & Tønsberg (2008), 122 (photo); Stenroos et al. (2011), 335-6 (photos); Wirth (1995), 2: 680, 689 (photo); Wirth et al. (2004), 163 (photo); Wirth, Hauck & Schulz (2013), 1: 11 (photo); Brodo et al. (2001), 518-519 (photo); Hinds & Hinds (2007), 371-2 (photo); McCune & Geiser (2009), 239 & 256 (photos).

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 normally distinguished by the isidiate margins of the older lobes. Widespread and locally common on mossy boulders, tree-bases and on damp, heathy banks.

Peltigera praetextata, showing laminar and marginal isidia
Peltigera praetextata, with apothecia
Peltigera praetextata, colony on boulder
On mossy rocks, Glen Tilt, Perthshire, April 2008 (note that the pronounced, white lobe margins are a drying effect)
 
Peltigera praetextata
On woodland bank, Millport, Great Cumbrae, April 2010


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Uploaded May 2008, last updated January 2014