| <i>Enteromorpha pseudolinza</i> was already collected in 1984 along the coast of the Boulonnais; <i>Ceramium recissum</i> in 1974, '78, '81 and '90. The first observations of <i>Enteromorpha radiata</i> and <i>Aglaothamnion hookeri</i> in this region were only done in 1990. 11 <i>Enteromorpha</i> spp., 3 <i>Aglaothamnion</i> spp. and 6 <i>Ceramium</i> spp. are known from the northern French coast. These newly observed species are described and illustrated; completed identification keys are added. |
