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Seawrack

1911 Encyclopedia Britannica

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the detached seaweeds thrown up, often in great quantities, by the sea and used for manure, also formerly for making kelp. It consists largely of species of Fucus - brown seaweeds with flat branched ribbon-like fronds, characterized in F. serratus by a saw-toothed margin and in F. vesiculosus, another common species, by bearing air-bladders. Also of Zostera marina, so-called sea-grass, a marine flowering plant with bright green long narrow grass-like leaves.