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RED ALGAE Phylum Rhodophyta • • • • • 4,000 to 6,000 species Most abundant in the tropics Mostly marine Some freshwater forms (<100 species) Occur at greater depths than other algae (to 268 meters) • Unicellular, filamentous and simple multicellular (but never very large) Phylum Rhodophyta • Chlorophyll A only • Phycobilins (phycoerythrin usually abundant) • No flagella • Food storage in floridean starch • Mucilaginous covering around the cell • Complex life cycles! Phylum Rhodophyta • Unicellular form Porphyridium • Filamentous form Bangia • Multicellular forms Polysiphonia Batrachospermum Porphyridium Bangia Polysiphonia Batrachospermum Polysiphonia life cycle • Gametophytes (free living) Male and Female • Carposporophyte (within cystocarp) • Carpospore • Tetrasporophyte • Tetraspores (meiospores) • Gametophyte Antheridia Cystocarp Trichogyne Carpospores Tetraspores Significance • • • • • Source of agar Some consumed as human food Pit connections between cells Primitive eukaryotic cells (?) Coralline reds (calcium carbonate) Primary Secondary Questions?
