Lichens of Belgium, Luxembourg and northern France

Distribution map of Petractis clausa (Hoffm.) Kremp.  by Paul Diederich   Petractis clausa (Hoffm.) Kremp.
see legend below picture
Petractis clausa – France, Alpes-Maritimes, Coursegoules – © 2010 by J. M. Feraud

On shaded and slightly humid, calcareous rocks, always in natural conditions.

Belgium: Camp.: RRR, Mosan: AR, Ard.: RRR (<1900).

Luxembourg: - .

France: Lorr.: RRR.

Lit.: DG: 19, La69: 100, NL84: 16, NL87: 22, NL97: 53, Van den Broeck et al. (2008), Vězda (1965: 135).

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