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Alan Silverside's Lichen Pages
Usnea cornuta Körb.
Fruticose, tufted, much branched, variable, grey- to blueish-green, paler in well-lit situations, not blackened at the base, branches generally constricted or annulate at their junctions, finer branches sorediate and isidiate, small lateral branches rather rigid and curved, claw-like. Western and southern Britain, locally common, on trees and rocks.
Refs: James (2003), 17 (line illustrations); Smith et al. (2009), 923; Purvis et al. (1992), 624; Dobson (2005), 442 (photo); Holien & Tønsberg (2008), 66 (photo); Hinds & Hinds (2007), 493; Brodo et al. (2001), 715-6 (photo).
On trunk of Common Sallow (Salix cinerea subsp. oleifolia) in damp woodland, Orielton, Pembrokeshire, May 2009.
Identity confirmed by Pat Wolseley (TLC demonstration, chemotype with salazinic and constictic acids).
On Common Sallow (Salix cinerea subsp. oleifolia) in quaking swamp on lake edge, Orielton, Pembrokeshire, May 2009:
thallus in situ; fine branch showing soralia and isidia; branch with numerous isidiomorphs; non-blackened stem-base.
Identity confirmed by Pat Wolseley (TLC demonstration, chemotype with stictic, constictic and menegazziaic acids).
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Uploaded May 2009, last modified June 2010
