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Hypotrachyna laevigata (Sm.) Hale
 
(= Parmelia laevigata (Sm.) Ach.)


Thallus foliose, lobes smooth, light grey, rather square at the tips and with side-lobes curved around to enclose the sinuses, edges flat, undersurface black, with repeatedly branched rhizines; soralia rather large, terminal and well delimited, grey to dark grey; apothecia rare, margins smooth or somewhat sorediate. Locally common in damp woodland in high rainfall areas of western Britain.

Refs: Smith et al. (2009), 441; Purvis et al. (1992), 431 (as Parmelia); Dobson (2005), 194 (photo); Dobson (2011), 198-9 (photo); Jahns (1983), 196-7 (photo, as Parmelia); Whelan (2011), 100 (photo); Valcárcel et al. (2003), 270-1 (photo, as Parmelia); Holien & Tønsberg (2008), 52 (photo); Nordic Lichen Flora (2011) 4: 63, 157 (photo); Lichen Atlas of the British Isles 1: 1002 (1995) (as Parmelia).

 
Hypotrachyna laevigata, with soralia and apothecium
Thallus with soralia and an apothecium, on Oak (Quercus petraea), Isle of Bute, October 2008
 
Hypotrachyna laevigata
Hypotrachyna laevigata
Hypotrachyna laevigata, colony
On Oak (Quercus petraea), Loch Lomond, Stirlingshire, October 2008


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Uploaded March 2009, last updated August 2013