Assertion: kelp's pneumatocyst | /r/HasProperty | gas bladder
Facets:
Source sentences:
text: Blades develop at irregular intervals along the stipe, with a single pneumatocyst (gas bladder) at the base of each blade.
text: They typically feature a large, rootlike holdfast for attachment to the ocean floor, a stipe (primary stem) for the internal transport of organic material, and long branching stalks with blades that stay afloat by means of pneumatocysts (gas bladders).