What phylum of algae stores food in the form of floridean starch?

Rhodophytes stores food in the form of floridean starch. The red algae, or Rhodophyta, are one of the oldest groups of eukaryotic algae, and also one of the largest, with about 5,000–6,000 species of mostly multicellular, marine algae, including many notable seaweeds.

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