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Images of British Lichens

Punctelia reddenda (Stirt.) Krog
(= Parmelia reddenda Stirt.)

Thallus foliose, grey, underside black, lobe surfaces with white dots (pseudocyphellae) that may later develop into laminar soralia, which in turn may become partly corticate to form isidiomorphs or sub-erect growths, thallus medulla not reacting to sodium hypochlorite solution (positive pink or red reaction in all other British Punctelia species); apothecia apparently unknown in Britain. Local in the south and west, on mossy trunks and rocks in humid locations, generally in old forest.

Refs: Smith et al. (2009), 770; Purvis et al. (1992), 428 (as Parmelia reddenda); Dobson (2005), 374-5 (photo); Dobson (2011), 378 (photo); Arup et al. (1997), 232 (photo); Thor & Arvidsson (1999), 312 (photo), 441; Lichen Atlas of the British Isles 1: 1011 (1995) (as Parmelia).

Punctelia reddenda
On Oak (Quercus petraea), Ty Canol, Pembrokeshire, May 2009

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© A.J. Silverside
Uploaded March 2010, last updated May 2012