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Ascophyllum nodosum is a large, common cold water seaweed or brown alga (Phaeophyceae) in the family Fucaceae.Its common names include knotted wrack, egg wrack, feamainn bhuí, rockweed, knotted kelp and Norwegian kelp.
Bladder wrack is named for its conspicuous vesicles. Fucus vesiculosus, known by the common names bladderwrack, black tang, rockweed, sea grapes, bladder fucus, sea oak, cut weed, dyers fucus, red fucus and rock wrack, is a seaweed found on the coasts of the North Sea, the western Baltic Sea and the Atlantic and Pacific Oceans.
Fucus distichus L. subsp. edentatus (Bach.Pyl.) Powell, isotype herbarium specimen, 1910 Fucus distichus (rockweed) washed up at the high tide line at Morecambe Bay, along with other debris. Fucus distichus or rockweed is a species of brown alga in the family Fucaceae to be found in the intertidal zones of rocky seashores in the Northern ...
The midrib and lamina together constitute almost all of a rockweed, so that the lamina is spread throughout the alga rather than existing as a localized portion of it. Species like Fucus vesiculosus produce numerous gas-filled pneumatocysts (air bladders) to increase buoyancy.
Any variety of seaweed will work – sea lettuce, eelgrass, rockweed, kelp, Irish moss, or whatever else washes up on your local beaches.
Rockweed can form thick bands in the middle intertidal on rocky substrates. [1] The other common species of Fucus: Fucus spiralis, Fucus vesiculosus and Fucus serratus along with Ascophyllum nodosum form the main and dominant seaweeds on rocky shores.
Species of Fucus are recorded almost worldwide. They are dominant on the shores of the British Isles, [5] the northeastern coast of North America [6] and California. [3]In the British Isles these larger brown algae occur on sheltered shores in fairly well defined zones along the shore from high-water mark to below low water mark.
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