200 especies of seaweeds, fungi and seagrasses are reported between Playa del Reducto and Islote del Frances (Arrecife, SE Lanzarote): 9 Cyanophyta, 109 Rhodophyta, 34 Phaeophyta, 44 Chlorophyta, 2 Eumycota, and 2 Magnoliophyta. 24 genera and 46 species are recorded for the first time from Lanzarote island.