Fucus serratus

Taxobox | color = khaki
name = "Fucus serratus"
image_width = 250px

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regnum = Protista
divisio = Heterokontophyta
classis = Phaeophyceae
ordo = Fucales
familia = Fucaceae
genus = "Fucus"
species = "F. serratus"
binomial = "Fucus serratus"
binomial_authority = L.__NOTOC__"Fucus serratus" is a seaweed of the north Atlantic Ocean, known as toothed wrack or serrated wrack. [cite book |id=ISBN 0-86033-046-X |title=The book of seaweed |author=Alan P. Major |year=1977 |publisher=Gordon Cremonesi] It is olive–brown in colour and similar to "F. vesiculosus" and "Fucus spiralis". It grows from a discoid holdfast. The fronds are flat, about 2 cm wide, bifurcating, and up to 1 m long including a short stipe. It branches irregularly dichotomously. The flattened blade has a distinct midrib and is readily distinguished from related taxa by the serrated edge of the fronds. It does not have air vesicles, such as are found in "F. vesiculosus", nor is it spirally twisted like "F. spiralis".

The reproductive bodies form in conceptacles sunken in receptacles towards the tips on the branches. In these conceptacles oogonia and antheridia are produced and after meiosis the oogonia and anteridia are released. Fertilisation follows and the zygote develops, settles and grows directly into the diploid sporophyte plant.

Distribution and ecology

"Fucus serratus" is found along the Atlantic coast of Europe from Svalbard to Portugal, in the Canary Islands and on the shores of north-east America. Cite book |author=W. R. Taylor |year=1972 |title=Marine Algae of the Northeastern Coast of North America |publisher=University of Michigan Press |pages=520 pp |id=ISBN 0-472-08840-8] [cite web |url=http://www.algaebase.org/search/species/detail/?species_id=85&sk=0&from=results |title="Fucus serratus" Linnaeus |work=AlgaeBase |author=M. D. Guiry & Wendy Guiry |date=2006-11-23] It was introduced to Iceland and the Faroes by humans within the last 1000 years where it was first noted in a phycological survey in 1900. It grows very well on slow draining shores where it may occupy up to a third of the area of the entire seashore. Cite journal |quotes=no |author = J. A. Coyer, G. Hoarau, M. Skage, W. T. Stam & J. L. Olsen |year=2006 |title=Origin of "Fucus serratus" (Hereokontophyta; Fucaceae) populations in Iceland and the Faroes: a microsatellite-based assessment |journal=European Journal of Phycology |volume=41 |issue=2 |pages=235–246 |doi=10.1080/09670260600652820] It often dominates the rocky parts of the lower shore, exposed or emersed in rock pools, on all but the most exposed shores. cite book |author=F. G. Hardy & M. D. Guiry |year=2006 |title=A Check-list and Atlas of the Seaweeds of Britain and Ireland |publisher=British Phycological Society, London |url=http://seaweed.ucg.ie/check-list/check-list.pdf |id=ISBN 0-9527115-1-6]

Uses

"F. serratus" is used in Ireland and France for the production of cosmetics and for thalassotherapy.

References