Lichens of Belgium, Luxembourg and northern France
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Rhizocarpon polycarpum (Hepp) Th. Fr. |
On siliceous rocks, either in natural conditions or on slate debris in disused quarries.
Belgium: Ard.: RR.
Luxembourg: - .
France: - .
Lit.: Mü1: 144, NL87: 23, Sé: 139.