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Buellia violaceofusca G. Thor & Muhr


Thallus crustose, immersed in the substrate or thin, greyish white, somewhat granular, with slightly elevated, violet-brown soralia, usual chemical tests negative; apothecia and pycnidia unknown. A rare species on dry bark of mature oaks (Quercus) and Ash (Fraxinus excelsior), known from a few sites in N.E. England and eastern Scotland.

Refs: Smith et al. (2009), 238; Nordic Lichen Flora (2002) 2: 24, 95 (photo); Thor & Arvidsson (1999), 239 (photo).

Buellia violaceofusca
Buellia violaceofusca
Buellia violaceofusca
On dry bark of mature oak (Quercus), Cawdor Wood, Nairnshire, August 2010 (BLS meeting)
 
Buellia violaceofusca
On dry bark of mature oak (Quercus), Logie, Morayshire, August 2010 (BLS meeting)


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