primitive chlorophyll-containing mainly aquatic eukaryotic organisms lacking true stems and roots and leaves

brown algae; mostly marine and littoral eukaryotic algae

large brown seaweeds having fluted leathery fronds

any of various algae of the family Fucaceae

coarse brown seaweed growing on rocks exposed at low tide

brown algae seaweed with serrated edges

brown algae with rounded bladders forming dense floating masses in tropical Atlantic waters as in the Sargasso Sea

brown algae; mostly marine and littoral eukaryotic algae