This volume includes 7 orders, 12 families, 38 genera and 92 species of benthic brown algae. It includes an introduction to the islands, identification keys to genera and species and a comprehensive description and discussion of each taxon. The genera Lucasia (Sporochnales) and Herringtonia (Dictyotales) are newly described, as are 29 species of the genera Discosporangium, Feldmannia, Hincksia, Hecatonema, Myrionema, Streblonema, Compsonema, Myriactula, Lucasia, Sphacelaria, Dictyota, Distromium, Lobophora, Padina, Spatoglossum and Sargassum.