Images of British Lichens
Usnea articulata (L.) Hoffm.
Fruticose, much branched, prostrate or pendulous, often detached and draped over branches, continuing to grow, grey-green, not blackened at the base, branches smooth to minutely nodulose or sparsely spinulose, main branches becoming articulated into inflated, sausage-like sections. Formerly widespread in southern and western Britain but highly pollution sensitive and now rare except in the extreme south-west, on branches in tree canopies ond on hedges, rarely terrestrial on dunes.
Refs: James (2003), 15 (line illustrations); Smith et al. (2009), 921; Purvis et al. (1992), 622; Dobson (2005), 441 (photo); Dobson (2011), 448 (photo); Jahns (1983), 188-9 (photo); Whelan (2011), 148 (photo); Aptroot et al. (2011), 156 (photo); Tõrra & Randlane (2007), 420 (photo), 432; van Haluwyn et al. (2009), 120-1 (photos); Puntillo (1996), plate 41 (photo).
|On branch of Oak (Quercus) (wind-blown, fallen material, now dry), from Kingcombe Dorset, April 2009; borrowed|
from Robin Crump (so this is a set-up, branch balanced between two chairs, with a white-painted wall in the background).
|On Common Sallow (Salix cinerea subsp. oleifolia), abundant on one tree, in quaking swamp on lake edge,|
Orielton, Pembrokeshire, May 2009: thallus in situ; primary branch showing articulation; fine branches.
Identity confirmed by Pat Wolseley (TLC demonstration, fumarprotocetraric acid confirmed).
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Uploaded May 2009, last updated January 2016