Images of British Lichens
Peltigera rufescens (Weiss) Humb.
Upper surface of fresh thallus brown or grey-brown, ash-grey when dry, densely but minutely felted-tomentose, lacking bullate wrinkles (compare P. canina), lower surface white-tomentose, with branched, confluently-based rhizines that are white near the thallus margins but conspicuously dark-brown further under the lobes, veins also becoming dark brown under the lobe-bases, thallus margins upturned and crisped-undulate, thallus lacking isidia or soredia; apothecia vertical, on erect lobes. Widespread and locally common on dunes and on well-drained basic and ultrabasic soils.
Refs: Vitikainen (1994) 77-80 (photo); Smith et al. (2009), 672; Purvis et al. (1992), 443; Dobson (2005), 319; Dobson (2011), 320 (photo); Jahns (1983), 240-241 (photo); Nordic Lichen Flora (2007) 3: 127, 199 (photo); van Herk & Aptroot (2004, 2013), 286-7 (photo); Aptroot et al. (2011), 150-1 (photos); Wirth (1995), 2: 680, 690 (photo); Wirth et al. (2004), 162 (photo); Wirth, Hauck & Schulz (2013), 2: 827, 834 (photo); Moberg & Holmåson (1984), 177 (photo); Stenroos et al. (2011), 338 (photo); Hansen & Anderson (1995), 52 (photo); Brodo et al. (2001), 520 (photo); Hinds & Hinds (2007), 372-3 (photo); Walewski (2007), 35 (photo); McCune & Geiser (2009), 240 & 257 (photos); Øvstedal & Lewis Smith (2001), 263 (brief), plate 60 (photo).
The rhizine characters are useful when this species forms mixed colonies with P. canina in dune turf. P. didactyla, in its mature, apothecial, non-sorediate state, can also resemble P. rufescens.
|In dry and damp state (same colony), in sandy, Breckland turf, Thetford, Norfolk, April 2010. Lowest photograph showing underside with dark veins and rhizines.|
|Material with mature apothecia, in sandy, calcareous, Breckland turf, Mildenhall, Suffolk, April 2010.|
|In dune turf, Aberlady Bay, East Lothian, March 2007|
|In damp state (pubescence less obvious), in turf on upland roadside, Cabrach, Aberdeenshire, August 2009. Note dark veins on under-surface.|
|In dune heath, Shewalton Pits, Ayrshire, May 2009.|
Lichens HOME PAGE | Index of Species | Conditions of Use and e-mail contact | References | Site Home Page
© A.J. Silverside
Uploaded May 2008, last updated April 2014 (first hosted at www-biol.paisley.ac.uk, May 2007)