Syn.: B. aethaleoides (Nyl.) H. Olivier, incl. B. sororia Th. Fr.

Saxicolous, on siliceous rocks, usually in dry, sunny and nitrophilous conditions.

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

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

France: Ard.: RRR, Lorr.: RRR. Most probably overlooked and more common.

Lit.: Mü1: 157, NL77: 19, NL92: 150, Sé: 137.