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Images of British Lichens
Parmotrema reticulatum (Taylor) M.Choisy
(= Parmelia reticulata Taylor)
Thallus grey with a very fine, white, reticulate cracking of the surface cortex visible with a hand lens, numerous black, marginal cilia, underside black, with simple or branched rhizines that occur right to the lobe tips, soralia well delimited, apical, capitate; apothecia rare. On trees and rocks, very southern in Britain, extending up the west coast. [Description applies to P. reticulatum sens.strict., see Louwhoff in Smith et al. (2009) for details of P. pseudoreticulatum, which has recently been recognised in Britain.]
Refs: Smith et al. (2009), 663; Purvis et al. (1992), 433 (as Parmelia); Dobson (2005), 311 (photo); Dobson (2011), 312 (photo); van Haluwyn et al. (2009), 100-1 (photo); Frahm et al. (2010), 128 (photo); Hinds & Hinds (2007), 353 (photo); Brodo et al. (2001), 642-3 (photo, as Rimelia reticulata); Lichen Atlas of the British Isles 1: 1012 (1995) (as Parmelia). |
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On sunny, coastal rocks, Skomer, Pembrokeshire, May 2009, droplet shows KOH reaction (yellow -> red).
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On sunny, coastal rocks, Kynance Cove, Cornwall, June 2010
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On shaded oak (Quercus) trunk, Ardilistry, Islay (BLS meeting), May 2011, showing reticulate surface.
N.B., rhizines continued to the margin on the underside (= P. reticulatum s.s..) |
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© A.J. Silverside
Uploaded July 2009, last updated July 2012
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