Gracilaria is a genus of red algae that is known for its economic value as an agarophyte as well as its use as a food source for humans and numerous shellfish species.
The Chlorophyceae are a group of green algae that are differentiated primarily by their ultrastructural morphology.
Rhodophyceae is a family of marine algae that are mostly red in colour and have a membranaceous or filamentous structure.
No, Gracilaria does not come under class Chlorophyceae.