Sargassum polyphyllum is a species of brown (class Phaeophyceae) macroalgae or limu (seaweed) in the order Fucales.

[1] Sargassum polyphyllum, or limu kala, consists of thin, rough, wavy blades and a firm thallus.

[3] Sargassum polyphyllum is versatile and resilient enough to survive in areas such as harsh intertidal zones.

However, Sargassum polyphyllum is endemic to the Hawaiian Archipelago.

[4] In Hawaiian culture, limu kala is involved in certain religious practices such as asking for forgiveness and certain hula.