During a scuba survey on the rock formation "Les Ridens", at 21 km outside the Boulogne (northern France) coast, and at 20m depth, 5 different algae were collected, hitherto not yet found in situ along the coast: the Phaeophyta Halidrys siliquosa and the Rhodophyta Brongniartella byssoides, Calliblepharis ciliata, Delesseria sanguinea, Heterosiphonia plumosa.
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