Lichens of Belgium, Luxembourg and northern France
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Protoparmelia atriseda (Fr.) R. Sant. & V. Wirth |
On hard and rather exposed, siliceous rocks, always associated with Rhizocarpon geographicum.
Belgium: Ard.: RR.
Luxembourg: - .
France: Ard.: RRR.
Lit.: L4: 23 (sub Lecanora nephaea), Sé: 142.