On hard calcareous rocks in shaded and sheltered conditions, only in natural habitats.

Belgium: Mosan: R, probably overlooked.

Luxembourg: - .

France: - .

This species does not belong to Catillaria s. s., but its exact generic position is still problematic.

Lit.: Ertz: 19, L6: 140-141, NL84: 13, NL97: 46.