right|thumb|300px|Floating kelp (Macrocystis pyrifera) with many pneumatocysts
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.
Discovered by embedding cosine similarity (sentence-transformers MiniLM, 384-dim).