Syn.: Naetrocymbe saxicola auct. luxemb., non (A. Massal.) R. C. Harris

Non-lichenized, on calcareous or siliceous rocks and stones in streams, associated with algae and cyanobacteria, probably not lichenized.

Belgium: Mosan: RRR.

Luxembourg: Lorr.: RR.

France: Lorr.: RRR.

Lit.: Molitor & Diederich (1997: 74-76, sub Naetrocymbe saxicola), Roux (2009).