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Opegrapha niveoatra (Borrer) Laundon


Thallus very thin, grey to brown, lacking soredia; apothecia black, lirellate, small, rounded or ellipsoid to elongate and sinuous or sometimes branched or stellate, ascospores needle-like, 4-7(-8) septate, 20-30 × 2.5-4 µm (dimensions from Pentecost & James, in Smith et al., 2009), dot-like, black pycnidia generally abundant, commonly requiring microscopic examination of the spores and conidia for accurate identification. Widespread, on sheltered, ± nutrient-rich bark.

Refs: Smith et al. (2009), 641; Purvis et al. (1992), 410; Valcárcel et al. (2003), 260-1 (photo); van Herk & Aptroot (2004, 2013), 270-1 (photo).

 
Opegrapha niveoatra
On Hazel (Corylus avellana), Logie, Morayshire, August 2010 (BLS meeting)


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