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Fucus vesiculosus : ウィキペディア英語版 | Fucus vesiculosus
''Fucus vesiculosus'', known by the common name bladder wrack or bladderwrack, is a seaweed found on the coasts of the North Sea, the western Baltic Sea, and the Atlantic and Pacific Oceans, also known by the common names black tang, rockweed, bladder fucus, sea oak, black tany, cut weed, dyers fucus, red fucus, and rock wrack. It was the original source of iodine, discovered in 1811, and was used extensively to treat goitre, a swelling of the thyroid gland related to iodine deficiency. ==Description== The fronds of ''F. vesiculosus'' grow to long and wide and have a prominent midrib throughout. It is attached by a basal disc-shaped holdfast. It has almost spherical air bladders which are usually paired, one on either side of the mid-rib, but may be absent in young plants. The margin is smooth and the frond is dichotomously branched. It is sometimes confused with ''Fucus spiralis'' with which it hybridises and is similar to ''Fucus serratus''.〔Newton, L. 1931. A Handbook of British Seaweeds. London. British Museum (Natural History)〕
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