| Notes: |
Martina Trentini and Vânia Silva ------- Porto Judeu, Terceira, Azores, Portugal ------- Porto Judeu is a county town of Angra do Heroísmo with a population of 2 501 (according to the general census of 2011). It’s located in the south of Terceira Island in Azores, covering an area of 30.86 km², of which 28.5 km² on the island itself, and the remaining 2.36 km² made up of the Cabras Islets. Extends from the coast, where faced with the parishes of St. Sebastian and Feteira, inside, confronting around with the parishes of Ribeirinha, St. Benedict, St. Desk, Quatro Ribeiras and Agualva. |
| Description: |
Fucus spiralis is a hermaphrodite, intertidal brown seaweed, found on the high shore normally attached, generally to rock, by a discoid holdfast. Can be found on the coasts all around the British Isles, western coasts of Europe, Canary Islands and North-eastern America and has the common names of spiral wrack and flat wrack. It grows up to 30-40 cm long, without air bladders and lives for up to 4 years. Usually the frond is spiraled or twisted although that is not always obvious. However, when mature the swollen tips of the fronds are rounded and almost like a bunch of grapes. These are the receptacles (reproductive structures). The species can tolerate a high level of desiccation. Fronds have a characteristic ridge along the edge of the receptacles. The frond shows variation in its shape from one shore type to another and will be greatly affected by salinity fluctuations and wave action. |
Species:
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Fucus spiralis Linnaeus |
