Nereocystis luetkeana

Nereocystis luetkeana

''Nereocystis'' is a monotypic genus of kelp containing the species ''Nereocystis luetkeana''. Some common names include edible kelp, bull kelp, bullwhip kelp, ribbon kelp, giant kelp, bladder wrack, and variations on these names. It forms thick beds on rocks, and is an important part of kelp forests. It can grow to a maximum of 36 m . ''Nereocystis'' has a holdfast of about 40 cm , and a single stipe, topped with a pneumatocyst containing carbon monoxide, from which sprout the numerous blades. The blades may be up to 4 m long, and up to 15 cm wide. It is usually annual, sometimes persisting up to 18 months. ''Nereocystis'' is the only kelp which will drop spore patches, so that the right concentration of spores lands near the parent's holdfast. It is common along the Pacific Coast of North America, from Southern California to the Aleutian Islands, Alaska.
"Mermaid's bladder" Kelp Sep 2014.
It grows on rock from the low intertidal to subtidal; it prefers semi-exposed habitats or high current areas.These were washed ashore in a beach near Piedras Blancas, CA. Fall,Geotagged,Nereocystis luetkeana,United States


The thallus of this common canopy-forming kelp has a richly branched holdfast and a cylindrical stipe 10–36 m long, terminating in a single, gas-filled pneumatocyst from which the many blades, up to 10 m long, develop. Blade growth can reach 15 cm per day. Reproductive patches develop on the blades and drop to the seafloor at maturity.


The species ''Nereocystis luetkeana'' was named after Fyodor Petrovich Litke by Mertens and then described by Postels and Ruprecht.


This annual kelp grows on rock from the low intertidal to subtidal zones; it prefers semi-exposed habitats or high-current areas. Offshore beds can persist for one to many years, usually in deeper water than ''Eualaria'' or ''Macrocystis'', where they co-occur.


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SpeciesN. luetkeana