Small gas bladders -- pneumatocysts -- connect the kelp's stipes ("stems") to its blades ("leaves"). These bladders help elevate the kelp plant from the bottom, towards sunlight and the water's surface.
Kelp frond showing pneumatocysts. Santa Barbara Island, California, USA
Species: Giant kelp
, Macrocystis pyrifera
Location: Santa Barbara Island
Image ID: 02435
Format: Film 2:3
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