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Opegrapha physciaria (Nyl.) D.Hawksw. & Coppins


Thallus parasitic, non-lichenised, immersed in the host tissue; apothecia black, lirellate, irregularly rounded or elongate, gall-like, produced on the surface of the host, ascospores 3-septate, 12-17 × 4-6 µm (dimensions from Pentecost & James, in Smith et al., 2009). Host-specific on Xanthoria parietina, apparently rare, coastal, seemingly not following the recent expansion of the host with enhanced atmospheric nitrate/ammonia deposition.

Refs: Smith et al. (2009), 642; Wirth, Hauck & Schulz (2013), 2: 787 (as Phacothecium varium).

The specific name originates from when, long ago, Xanthoria parietina was included in the genus Physcia.

 
Opegrapha physciaria on Xanthoria parietina
Opegrapha physciaria on Xanthoria parietina
Opegrapha physciaria on Xanthoria parietina
Opegrapha physciaria on Xanthoria parietina
On thallus of Xanthoria parietina on Ash (Fraxinus excelsior) in coastal woodland, Slapton, Devon, August 2011


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