Images of British Lichens
Parmelina carporrhizans (Taylor) Poelt & Vězda
(= Parmelia carporrhizans Taylor; Parmelia quercina (Willd.) Vain. var. carporrhizans (Taylor) V.Wirth)
A foliose lichen forming rosettes, lobes grey to blue-grey, slightly lustrous, surface marbled, lacking isidia; apothecia frequent, with red-brown discs and thick, thalline margins, black rhizines projecting radially from the underside at the point of attachment. On nutrient-rich bark, often on horizontal branches, near the coast in south-west England and western Wales but rare and apparently decreasing.
Refs: Smith et al. (2009), 657; Purvis et al. (1992), 426 (as Parmelia quercina); Dobson (2005), 306 (photo, as Parmelina quercina); Dobson (2011), 307 (photo); van Haluwyn et al. (2009), 40-41 (photo); Puntillo (1996), plate 28 (photo, as Parmelia); Wirth (1995), 2: 645 (as Parmelia quercina var. carporrhizans); Lichen Atlas of the British Isles 1: 1010 (1995) (as Parmelia quercina).
True P. quercina is now known to have occurred in Britain but is apparently extinct here (Döring & Aguirre-Hudson (2012) British Lichen Society Bulletin 111: 115-6); van Haluwyn et al. (2009) provide a tabulated and photographic comparison of the two species.
|On branch of Ash (Fraxinus excelsior) in humid woodland, Slapton, South Devon, August 2011, lower four photographs showing damp state|
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Uploaded June 2012, last updated January 2013