Lichens of Belgium, Luxembourg and northern France
 
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Gyalecta hypoleuca (Ach.) Zahlbr. | 
Syn.: Petractis hypoleuca (Ach.) Vězda
On shaded, calcareous, natural outcrops.
Belgium: Mosan: RR, possibly overlooked.
Luxembourg: - .
France: - .
Lit.: DG: 19, Ertz: 20, 27, L8: 64, Vězda (1965: 138).