Syn.: C. pulposum (Bernh.) Ach., C. palmatum auct.

Usually on soil, also along fissures on calcareous or slightly calcareous, siliceous rocks, normally in exposed, either natural or artificial, habitats, often abundant in ruderal conditions.

Belgium: Mar.: RR, Fl.: RR, Camp.: RRR, Brab.: RR, Mosan: AR, Ard.: RR, Lorr.: RR.

Luxembourg: Lorr.: AC.

France: Mar.: AR, Boul.: RRR, Pic.: RR, Mosan: RR, Lorr.: R.

Lit.: Boul.: 68, DG: 20, Ertz: 19, NL84: 13, Degelius (1954: 150-183).