Pneumatocyst
Sign in to saveright|thumb|300px|Floating kelp (Macrocystis pyrifera) with many pneumatocysts
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right|thumb|300px|Floating kelp (Macrocystis pyrifera) with many pneumatocysts
In phycology, a pneumatocyst is a floating structure that contains gas found on brown seaweed. A seaweed's thallus may have more than one. They provide buoyancy to lift the blades toward the surface, allowing them to receive more sunlight for photosynthesis.
Excerpted from Wikipedia’s “Pneumatocyst” article, available under the CC BY-SA 4.0 licence.