Gigartinales

Gigartinales is a red algae order in the class Florideophyceae.

Furcellaria is a genus of red algae. It is a monotypic genus, the only species being Furcellaria lumbricalis, which has commercial importance as a raw material for carrageenan production. It is mainly harvested from the waters of Denmark and Canada.

Catenella is a genus of red algae belonging to the family Caulacanthaceae.

Gloiopeltis is a genus of red algae belonging to the family Endocladiaceae.

Hypnea is a genus of red algae, and a well known carrageenophyte (plant producing polysaccharide carrageenan).

species of alga

Polyidaceae is a red algae family in the order Gigartinales.