We report new records and chorological data for seven French marine algae that make their distribution records more complete. Three species (Erythroglossum lusitanicum, Hildenbrandia occidentalis and Ulva bifrons) are new records for France, two species (Antithamnion hubbsii and Pterocladiella melanoidea) are new records for the French Atlantic coast and two species (Haraldiophyllum bonnemaisonii and Ptilothamnion sphaericum) are new records for the South Atlantic coast of France. Although the Atlantic marine algae of France are well studied, the new findings show that it is still necessary to carry out further floristic studies to complete our knowledge about the marine algae in this region. We describe for the first time mixed phases bearing both cystocarps and tetrasporangia in Lomentaria orcadensis.
