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Correct me if I'm wrong, but Halimeda is an algae, not a plant. Mangroves would be considered plant.
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It's both in a way, but it is considered an algae.
Halimeda is a genus of green algae, with many species in tropical waters worldwide. It is easily recognised by its shape, which consists of calcified segments, connected to each other by very narrow points
Each plant is attached to the substrate by a stalk and holdfast, or in the case of species living in sand or unstable sediment, the stalk forms a swollen bulb to anchor the plant.