Fucus ceranoides
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Description
Fucus ceranoides is a species similar to other species of Fucus. It is linear to about 1 cm wide and is attached by a discoid holdfast. The branches grow to a length of 60 cm and show a clear midrib. Its margin is entire and it differs from Fucus serratus in not having a serrated edge and unlike Fucus vesiculosus it does not have air vesicles, however irregular swellings gives it a resemblance to F. vesiculosus. Fucus spiralis has spirally twisted fronds.
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Distribution
Fucoids have no planktonic dispersal stages, restricting gamete dispersal. They can be found on the shores of Ireland and Great Britain including the Isle of Man and Shetland.
Habitat
Fucus ceranoides is restricted to estuarine intertidal habitats under fluctuating salinities. The modern distribution of Fucus ceranoides ranges from Portugal to Norway and Iceland. This includes the rocky shores in the littoral generally where fresh water flows into the sea, brackish water in sheltered bays.