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Peltigera canina (L.) Willd.


Upper surface of fresh thallus grey-brown, with convex wrinkles ('bullate') (compare P. rufescens), ash-grey and lacking wrinkles when dry, densely but minutely felted-tomentose, lacking isidia, margins of main lobes generally down-turned towards the tips but side-margins often erect, crisped-undulate (beware key in Smith et al. (2009)!), lower surface white-tomentose, with irregular, fluffy, confluently-based rhizines. Widespread but local in turf on dunes and on gravelly and sandy soils inland.

Refs: Vitikainen (1994) 29-32 (photo); Smith et al. (2009), 667; Purvis et al. (1992), 443; Dobson (2005), 315 (photo); Dobson (2011), 316 (photo); van Herk & Aptroot (2004, 2013), 282-283 (photo); Aptroot et al. (2011), 134-5 (photos); Wirth, Hauck & Schulz (2013), 2: 827, 828 (photo); Nordic Lichen Flora (2007) 3: 116, 192 (photo); Moberg & Holmåson (1984), 172 (photo); Holien & Tønsberg (2008), 122 (photo); Stenroos et al. (2011), 315 (photo); Brodo et al. (2001), 506-7 (photo); Hinds & Hinds (2007), 358-9 (photo); McCune & Geiser (2009), 239 & 244 (photos).

Over-reported and confused with the larger and much commoner P. membranacea. In dry state, closely resembles P. rufescens, with which it commonly grows; attention to characters of the lower surface is required.

Peltigera canina, dry
Peltigera canina, damp
In sandy, Breckland turf, Thetford, Norfolk, same colony in dry and damp state, April 2010
 
Peltigera canina
Peltigera canina
Peltigera canina, showing rhizines
In dune turf, Aberlady Bay, East Lothian, January 2007


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© A.J. Silverside
Uploaded May 2008, last updated January 2014 (first hosted at www-biol.paisley.ac.uk, May 2007)