Seaweeds anchor to surfaces by means of a holdfast. The main body of a seaweed may be divided into fronds or blades, which provide a large surface for the absorption of sunlight. The stem of a seaweed is called a stipe, absent in small seaweeds. Air-filled bladders called floats help to keep the stipe and fronds buoyant.
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Te Ara - The Encyclopedia of New Zealand
Photograph by Melanie Lovell-Smith
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