Images of British Lichens
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: Nordic Lichen Flora (2011) 4: 114, 167 (photos, printed too dark); James (2003), 17 (line illustrations); Smith et al. (2009), 923; Purvis et al. (1992), 624; Dobson (2005), 442 (photo); Dobson (2011), 449 (photo, but text entry with confusing format); van Haluwyn et al. (2009), 122-3 (photos); Valcárcel et al. (2003), 368-9 (photo); Holien & Tønsberg (2008), 66 (photo); Hinds & Hinds (2007), 493; Brodo et al. (2001), 715-6 (photo); McCune & Geiser (2009), 363 & 366 (photos).
Host to the lichenicolous fungus, Biatoropsis usnearum.
|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 updated October 2013