Syn.: Toninia caeruleonigricans auct., non (Lightf.) Th. Fr. ('coeruleonigricans' is an orthographic variant), Thalloidima caeruleonigricans auct.

In fissures or on highly disintegrated natural, calcareous rocks, also in Mesobromion communities, usually in dry and sunny conditions.

Belgium: Mar.: R (†<1900), Brab.: RR, Mosan: AR, Ard.: RRR (†<1900).

Luxembourg: Lorr.: RR.

France: Mar.: RR, Mosan: RR, Lorr.: RRR.

Lit.: BDL1: 211, Boul.: 73, Ertz: 20, La69: 126, NL84: 17, NL97: 56.