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Images of British Lichens

Hypotrachyna britannica (D.Hawksw. & P.James) Coppins
(= Parmelia britannica D.Hawks. & P.James)

A small, foliose species with thallus lobes rounded to rather square at the tips, upper surfaces smooth, matt to lustrous, light grey, edges flat to curved slightly downwards (revolute) and often tinged tan-brown, undersurface dark brown to black, with unbranched and branched rhizines; soralia rather large in relation to the size of the thallus, lateral and terminal or developing from pustules on the lobe surfaces, well delimited, rounded to almost capitate, blue-grey to dark grey or blackish; apothecia unknown. Locally frequent on nutrient-poor rocks in western Britain, especially on the coast.

Refs: Smith et al. (2009), 440; Purvis et al. (1992), 430 (as Parmelia); Dobson (2005), 193 (photo); Dobson (2011), 198 (photo); Lichen Atlas of the British Isles 1: 986 (1995) (as Parmelia).

Hypotrachyna britannica
In heathy vegetation on rocks, Ty Canol, Pembrokeshire, May 2009
Hypotrachyna britannica
On coastal rocks, Skomer, Pembrokeshire, May 2009
Hypotrachyna britannica
On coastal rocks, Prawle Point, Devon, August 2011

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© A.J. Silverside
Uploaded December 2011, last updated May 2012