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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); Valcárcel et al. (2003), 276-7 (photo, as Parmelia); 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).

Parmotrema reticulatum
Parmotrema reticulatum
On sunny, coastal rocks, Skomer, Pembrokeshire, May 2009, droplet shows KOH reaction (yellow -> red).
Parmotrema reticulatum
Parmotrema reticulatum
Parmotrema reticulatum, enlarged view showing reticulations
On sunny, coastal rocks, Kynance Cove, Cornwall, June 2010
Parmotrema reticulatum
Parmotrema reticulatum, enlarged view
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 August 2013