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Pelvetia canaliculata, the channelled wrack, [2] is a very common brown alga (Phaeophyceae) found on the rocks of the upper shores of Europe. It is the only species remaining in the monotypic genus Pelvetia .
Pelvetia canaliculata forms a zone at the top of the shore. Just below this Fucus spiralis, Fucus vesiculosus, Fucus serratus and Laminaria form clear zones, one below the other, along the shore down to low water mark.
Fucus serratus, "toothed wrack" Pelvetia canaliculata, "channelled wrack" Accumulation of detrital seagrass wrack (Posidonia australis) at West Beach, South Australia Wrack washed ashore in Brunswick, Georgia by Hurricane Matthew. Wrack is part of the common names of several species of seaweed in the family Fucaceae.
A mycophycobiosis (composed of myco-, from the Ancient Greek: μύκης (mukês , "mushroom"), phyco-, from Ancient Greek: φῦκος, (phûkos, fucus, used for algae), and -biose, from ancient Greek: βιόω (bióô, "to spend one's life") is a symbiotic organism made up of a multicellular algae and an ascomycete fungus housed inside the algae (in the thallus for example).
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The saltmarsh is ungrazed and is dominated by sea-purslane (Halimione portulacoides) and by the most northerly British colony of the seaweeds Bostrychia scorpioides, Fucus vesiculosus and Pelvetia canaliculata.
Brown algae exist in a wide range of sizes and forms. The smallest members of the group grow as tiny, feathery tufts of threadlike cells no more than a few centimeters (a few inches) long. [6]
The usual zonation of weeds on these shore is, at the top channel wrack (Pelvetia canaliculata (L.) Dcne. et Rhur.), followed by spiral wrack (Fucus spiralis L.), then knotted wrack (Ascophyllum nodosum (L.) Le Jol) with some admixture of bladder wrack (Fucus vesiculosus) L. and then serrated wrack (Fucus serratus L.) before coming to the low ...