Gelidiales

The Gelidiales is a small order of red algae containing ten genera, and approximately 130–160 species, many of which are used to make agar.

The Gelidiellaceae is a small family of red algae containing 5 genera of agarophytes.

The Pterocladiaceae is a small family of red algae containing 2 genera of agarophytes.

Gelidiella is a genus of red algae (phylum Rhodophyta). Worldwide there are 22 species of Gelidiella, mostly tropical and subtropical. Gelidiella and Gelidium are now both united into one order Gelidiales.