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holdfast
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holdfast

Organ found at the base of many seaweeds, attaching them to the sea bed. It may be a flattened, suckerlike structure, or dissected and fingerlike, growing into rock crevices and firmly anchoring the plant.



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? Mentioned in ? References in periodicals archive
 
The spiny grazers nibble on the kelp holdfasts, or the strands that anchor the seaweed to the seafloor.
As algae-eaters, urchins feed on the holdfasts of the kelp, resulting in a sea floor completely devoid of vegetation.
 
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