Dimelaena oreina Cf. (Ach.) Norman forme maritime atlantique.
We report here a taxon (under study) difficult to classify which we tentatively attribute to a form of Dimelaena oreina. This form comes on the rocks very exposed to the projections of sea water and to the sun, it is usually sterile, or with sterile apothecia, it is difficult to eliminate other species belonging to the genera: Buellia, Rinodina and also Diploicia and in particular a parasitized form (by Lichenostigma diploiciae?) of Diploicia subcanescens forme maritime atlantique which is often close on the same rock.