Tange kann man in drei Hauptgruppen einteilen: Grünalgen, Braunalgen und Rotalgen. Blaualgen werden nicht zu den Algen gerechnet, sondern zu den Bakterien. ###>Seaweed can be divided into a number of large groups: green seaweed, brown seaweed and red seaweed. 'Blue-green' algae, also known as cyanobacteria, is sometimes considered a seaweed but it is more like a bacteria.