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