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Opegrapha ochrocheila Nyl.


Thallus very thin, pale grey, sometimes tinged green or brownish, or immersed in the substrate; apothecia black, lirellate, to 2.5mm but usually smaller, ellipsoid to elongate and sinuous, or branched or stellate, generally deep yellow- to orange-red-pruinose, ascospores ellipsoid to clavate, 3-septate, (12-)14-16(-22) × 3-4.5(-5) µm (dimensions from Pentecost & James, in Smith et al., 2009). If the characteristic pruina is absent, microscopic examination is required for accurate identification. Widespread, on shaded bark and wood, rarely on siliceous rock.

Refs: Smith et al. (2009), 641; Purvis et al. (1992), 410; Dobson (2005), 290 (photo); Dobson (2011), 293 (photo); van Herk & Aptroot (2004, 2013), 270-1 (photo); Arup et al. (1997), 192 (photo); Thor & Arvidsson (1999), 292 (photo).

 
Opegrapha ochrocheila
On Ash (Fraxinus excelsior), Ballygrant, Islay, May 2011 (BLS meeting)


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uploaded February 2014