Lirellate lichen

[peterbolson]

On a granite (I think) stone wall. Thallus grey, lirellae about 1mm long.
I think it is Opegrapha sp., possibly O.conferta rather than O.calcarea but I feel very out of touch at the moment so I'd be grateful for help.



Thanks

Peter

[JennyS]

Hi again - in Dobson 2005 and The Lichens of Great Britain and Ireland (Smith et al. 2010) O.conferta is one of several former species that are now included as Opegrapha calcarea. They all have 3-septate spores.

O. cesareensis is a similar, coastal species but has 4-5 septate spores.

[peterbolson]

Thanks Jenny