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Usnea ceratina Ach.


Thallus usually pendant, though rather rigid and wiry, base not blackened, branches becoming scabrid with white tubercles that develop soralia at their tips, medulla generally pinkish and testing yellow with bleach (sodium hypochlorite), this test diagnostic in Britain wihin the genus for this species; apothecia rare. On mature trees in the south and south-west, very scattered elsewhere.

Refs: Nordic Lichen Flora (2011) 4: 114, 167 (photos, printed too dark); James (2003), 16 (line illustrations); Smith et al. (2009), 922; Purvis et al. (1992), 623; Dobson (2005), 441-2 (photo); Dobson (2011), 448-9 (photo); Jahns (1983), 188-9 (photo); Thor & Arvidsson (1999), 336 (photo); Brodo et al. (2001), 715 (photo).

FGBI: http://fungi.myspecies.info/lichens/usnea-ceratina

 
Usnea ceratina
Usnea ceratina
Usnea ceratina, close view
Shipley Bridge, Dartmoor, Devon, August 2011


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Uploaded October 2013