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Images of British Lichens

Parmotrema perlatum (Huds.) M.Choisy
(= Parmotrema chinense auct.; Parmelia perlata (Huds.) Ach.)

A relatively large, foliose species with smooth thallus, pearl-grey when dry, more greenish when damp, with very short, inconspicuous and often sparse, black, marginal cilia, underside black, with simple rhizines and a bare, tan-coloured zone towards the margin, soralia well delimited, marginal and apical; apothecia rare. Widespread, common in much of western and southern Britain; until recently largely absent from central and eastern England as a result of sulphur dioxide pollution, but now rapidly recolonising these areas as SO2 levels have dropped.

Refs: Smith et al. (2009), 662; Purvis et al. (1992), 431 (as Parmelia); Dobson (2005), 310 (photo); Dobson (2011), 311-2 (photo); Allen (2007), 10, 16 & 37 (photos); Jahns (1983), 194-5 (photo, as Parmelia); Whelan (2011), 123 (photo); van Haluwyn et al. (2009), 100-1 (photo); van Herk & Aptroot (2004, 2013), 280-281 (photo, as P. chinense); Valcárcel et al. (2003), 274-5 (photo, as Parmelia); Nordic Lichen Flora (2011) 4: 96, 164 (photo, printed too dark); Wirth (1995), 2: 673 (photo, as P. chinense); Wirth et al. (2004), 109 (photo, as P. chinense); Wirth, Hauck & Schulz (2013), 2: 810, 818 & 820 (photos); Frahm et al. (2010), 127 (photo); Hinds & Hinds (2007), 352 (photo); Brodo et al. (2001), 493 (photo, as P. chinense); McCune & Geiser (2009), 233 (photo); Lichen Atlas of the British Isles 1: 1008 (1995) (as Parmelia).

Parmotrema perlatum
Parmotrema perlatum
Parmotrema perlatum
On trunk of hybrid willow (Salix x fragilis, backcross to S. alba, commercial planting), Saltash, Cornwall, August 2008.
Uppermost photograph with Flavoparmelia caperata; lowermost photograph showing soredia, thallus still damp and greenish from morning dew.
Parmotrema perlatum
On trunk of Sessile Oak (Quercus petraea), Loch Lomond, Stirlingshire, October 2008.
Parmotrema perlatum, showing marginal cilia
Marginal cilia, material from Saltash, Cornwall, August 2008.
Parmotrema perlatum, showing underside
Underside, showing simple rhizines and tan-coloured marginal zone, material from Saltash, Cornwall, August 2008.

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© A.J. Silverside
Uploaded July 2009, last updated December 2013