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PHYCOGENETIC COMPARISON OF THE SMALL‐SUBUNIT RIBOSOMAL DNA SEQUENCE OF COSTARIA COSTATA (PHAEOPHYTA) WITH THOSE OF OTHER ALGAE, VASCULAR PLANTS AND OOMYCETES 1

The small‐subunit ribosomal DNA (rDNA) coding sequence was determined for the help Costaris Costata (Phaeophyta) and compared to those of chlorophyll a + b‐ and chlorophyll a + c‐containing vascular and nonvascular plants. Phylogenetic comparison of all sequences indicated a common ancestor for phaeophytes, chrysophytes and oomycetes. Phylogenies based on rDNA sequence data and those based on plastid characteristics were compared. Relative evolutionary distances between some taxa, derived from rDNA sequence data, conflicted with findings of plastid‐based phylogenies.