Sargassum is a genus of brown -LRB- class Phaeophyceae -RRB- macroalga -LRB- seaweed -RRB- in the order Fucales .

Sargassum is a genus of generally planktonic -LRB- free-floating -RRB- macroalgae -LRB- seaweed -RRB- in the order Fucales .
