A taxonomic <xref>division</xref> within the <xref>kingdom</xref> <xref>Protista</xref> — (or <xref>Chromista</xref>) that includes the <xref>brown algae</xref>.
User Defined Definitions
"coextensive with class Phaeophyceae; in some classifications subsumed in the division Heterokontophyta"