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Múr buidhe is a kind of sea weed found on the shore and can be picked only when the tide is out.
It grows from a stalk that takes root on the rocks and has only a few flat leaves, about five or six feet long and about four inches wide. When picked, it is spread out to dry for a day or two and it can then be packed until it is wanted for use.
It is useful in many ways. Iodine is made from it