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Images of British Lichens

Punctelia subrudecta (Nyl.) Krog
(= Parmelia subrudecta Nyl.)

Thallus foliose, grey even when fresh, but can be vivid green when wet, margins dark brown, glossy (not pruinose), underside cream to brown, lobe surfaces with puntate, white dots (pseudocyphellae) that develop into well-delimited, round, laminar soralia, thallus margins sometimes also becoming sorediate later; apothecia said to have red-brown discs, but very rare. Widespread and locally common on a variety of trees, becoming scarce in the north-east and in northern Scotland, spreading into urban areas with the reduction in sulphur dioxide pollution.

Refs: Van Herk & Aproot (2000) Lichenologist 32: 233-246 (photos, detailed descriptions); Smith et al. (2009), 771; Dobson (2005), 375 (photo); Dobson (2011), 379 (photo); Whelan (2011), 136 (photo); van Haluwyn et al. (2009), 102-3 (photo); van Herk & Aptroot (2004, 2013), 326-7 (photo, printed with green cast in my copy); Frahm et al. (2010), 146 (photo); Wirth, Hauck & Schulz (2013), 2: 808, 959 (photo); Nordic Lichen Flora (2011) 4: 104, 166 (photo); Thor & Arvidsson (1999), 313 (photo), 442; Valcárcel et al. (2003), 280-1 (photo, as Parmelia); Puntillo (1996), plate 29 (photo); Lichen Atlas of the British Isles 1: 1021 (1995) (as Parmelia, includes P. jeckeri). [Jahns (1983), 199 fig. 426 (as Parmelia borreri) apparently represents this species, fide Van Herk & Aptroot, but fig. 427, labelled "Parmelia subrudecta", is a true Parmelia (P. saxatilis or P. sulcata, opinions vary). P. subrudecta is not now believed to occur in N. America and so illustrations in American publications will not apply to this species.]

Punctelia subrudecta
On Ash (Fraxinus excelsior), Saltash, Cornwall, August 2008
Punctelia subrudecta, wet
On Ash (Fraxinus excelsior), Saltash, Cornwall, August 2008, same colony as above, wet and green from early morning rain
Punctelia subrudecta, wet
Green after heavy rain, on Oak (Quercus petraea), Loch Lomondside, Stirlingshire, October 2008

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Uploaded March 2010, last updated December 2013