Syn.: R. montagnei Körb.

On exposed, natural, siliceous rocks.

Belgium: Brab.: RRR, Ard.: RR.

Luxembourg: - .

France: - .

The identity of the populations referred to this species in the study area requires further studies.

Lit.: DG: 25, NL77: 23, Werner (1962: 12, misidentification for R. geminatum).