All Seaweeds and Macroalgae

Multicellular, visible to the naked eye algae, the red, brown and larger green algae and their freshwater relatives such as the stoneworts, that grow attached to rock, sediment or other surfaces rather than drifting as plankton. Covers kelp forests, wracks, nori and other edible seaweeds, and the large charophyte algae most closely related to land plants, identified by their own sourced description rather than by name. Excludes single celled and colonial microalgae too small to see without magnification, which belong in Diatoms and Other Microalgae, and excludes the cyanobacteria, which despite sometimes forming visible mats are bacterial rather than eukaryotic algae and are grouped separately.