Incl. V. nigrescens f. tectorum (A. Massal.) Coppins & Aptroot, V. tectorum (A. Massal.) Körb., V. controversa A. Massal.

On calcareous, natural outcrops, and on artificial substrates (walls, bricks, concrete, mortar, etc.).

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

Luxembourg: Ard.: RR, Lorr.: AC.

France: Mar.: AR, Boul.: R, Pic.: RR, Lorr.: AR. Most probably common in most parts of the study area.

The blastidiate morph of this species is sometimes treated as the form tectorum.

Lit.: Boul.: 73-74, Ertz: 43-44, Mü1: 140, NL77: 23, NL87: 24, NL84: 18, NL92: 174, NL93: 46, NL97: 57, VGH: 114.