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Laminariales

(kelps) An order of the Heterogeneratae, a subclass of the *Phaeophyta. It contains the largest known algae, Macrocystis and Nereocystis. Most species occur below the low-tide mark. The sporophyte thallus is differentiated into a holdfast, stipe, and lamina. The gametophyte generation is much smaller and simpler and shows well developed oogamy. Certain species yield alginic acid, which is commercially important as an emulsifying agent.

 
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