Phaeophyceae is a class of brown algae within the phylum Phaeophyta, comprising numerous seaweed species such as kelp. The term is used in formal botanical and phycological contexts to describe this distinct, pigment-rich group, characterized by brownish coloration due to fucoxanthin. In practice, scientists refer to Phaeophyceae when discussing evolutionary biology, ecology, and taxonomy of brown algae.
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