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Flavoparmelia soredians (Nyl.) Hale
Very similar to F. caperata but with somewhat smaller lobes, which are more adpressed to the substrate surface, soralia said not to be so distinctly pustular when young, confirmed by the bright yellow to red reaction with KOH (dirty yellow in F. caperata). On trees and rocks, predominantly southern and coastal, but becoming more common inland in urban areas.
Refs: Smith et al. (2009), 404; Purvis et al. (1992), 429 (as Parmelia soredians); Dobson (2005), 175 (photo); van Herk & Aptroot (2004), 182-183 (photo).
On coastal rocks, Skomer, Pembrokeshire, May 2009
On trunk in urban park, showing K+ yellow to red reaction, Pembroke, Pembrokeshire, May 2009
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Uploaded July 2009, last modified June 2010
