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Pseudevernia furfuracea (L.) Zopf


Thallus foliose, with narrow, strap-shaped lobes (but shorter, broader lobes with spreading side-lobes when young, sometimes remaining dimorphic), attached at one point and often pendant, so appearing fruticose, lower surface initially white but becoming black, with inturned margins, upper surface becoming isidiate; apothecia rare, large, with shiny, tan-brown discs, shortly stalked. Widespread and often common on acid-barked trees and fence posts, less often on base-poor rocks.

Refs: Smith et al. (2009), 759; Purvis et al. (1992), 506; Dobson (2005), 368 (photo); Dobson (2011), 372 (photo); Britton (2008) 39 (photo); Fox et al. (2003), plate 4 (photo); Jahns (1983), 190-1 (photo); van Haluwyn et al. (2009), 142-3 (photos); van Herk & Aptroot (2004, 2013), 322-3 (photo, young material); Valcárcel et al. (2003), 328-9 (photo); Wirth (1995), 2: 782-3 (photo); Wirth et al. (2004), 57 (photo); Wirth, Hauck & Schulz (2013), 2: 941 (photos); Frahm et al. (2010), 157 (photo); Moberg & Holmåson (1984), 82 (photo); Holien & Tønsberg (2008), 43 (photo); Stenroos et al. (2011), 384-5 (photo); Nordic Lichen Flora (2011) 4: 102, 165 (photo).

 
Pseudevernia_furfuracea, showing black underside of thallus
Kindrogan, Perthshire, April 2002
 
Pseudevernia_furfuracea, with apothecia
Pseudevernia_furfuracea, detached collection with apothecia
Braemar, Aberdeenshire, March 2008 (with apothecia)
 
Pseudevernia_furfuracea, showing dimorphic thallus
Pseudevernia_furfuracea, showing dimorphic thallus
Titisee, Germany, June 2008, showing dimorphic thallus


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