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Images of British Lichens

Opegrapha pertusariicola Coppins & P.James

Thallus parasitic, non-lichenised, immersed in the host tissue; apothecia black, lirellate, tiny, oval, single or in clusters produced on the surface of the host, asci 4-spored, ascospores (5-)6-septate, 21-28 × 4.5-6 µm (dimensions from Pentecost & James, in Smith et al., 2009). Host-specific on Pertusaria leioplaca, northern and western, on Hazel (Corylus) in old woodland.

Refs: Coppins & James (1979), Lichenologist 11: 164; Smith et al. (2009), 642; Purvis et al. (1992), 411; Hawksworth (1983), 17.

Opegrapha pertusariicola on Pertusaria leioplaca
Opegrapha pertusariicola on Pertusaria leioplaca
On thallus of Pertusaria leioplaca on Hazel (Corylus avellana) in ancient woodland, Logie, Morayshire, August 2010 (BLS meeting)

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