Bull kelp

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Bull kelp is a common name for the brown alga Nereocystis luetkeana which is a true kelp in the family Laminariaceae).

Species in the genus Durvillaea are also sometimes called bull kelp but this is just a shortening of the common name southern bull kelp. Durvillaea is a genus in the family Durvillaeaceae in the order Fucales and, though superficially similar in appearance, is not a true kelp (all of which are in the order Laminariales)