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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 .
Wrack is part of the common names of several species of seaweed in the family Fucaceae. ... Ascophyllum nodosum "Spiral wrack" or "flat wrack", Fucus spiralis
Vertebrata lanosa on Ascophyllum nodosum 1 tufts growing on Ascophyllum nodosum; 2 portion of a frond; 3 ceramidia = cystocarps; 4 branchlet with embedded tetraspores; 5 tetraspore; 6 apices with antheridia; 7 antheridium; 8 portion of a frond, partly cut longitudinally; 9 transverse section of a frond
On sheltered shores Ascophyllum nodosum usually forms a broad and dominating zone along the shore at the mid-littoral. Other brown algae can be found at the low-littoral such as Himanthalia, Laminaria saxatilis and Alaria esculenta. Small green and red algae and animals occur, protected under these large brown algae. [7]
Most brown algae contain the pigment fucoxanthin, which is responsible for the distinctive greenish-brown color that gives them their name. Brown algae are unique among Stramenopiles in developing into multicellular forms with differentiated tissues , but they reproduce by means of flagellated spores and gametes that closely resemble cells of ...
Ascophyllum nodosum exposed to the sun in Nova Scotia, Canada Dead man's fingers (Codium fragile) off the Massachusetts coast in the United States The top of a kelp forest in Otago, New Zealand. Seaweed, or macroalgae, refers to thousands of species of macroscopic, multicellular, marine algae.
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The other common species of Fucus on the coasts of British Isles: Fucus spiralis, Fucus vesiculosus and Fucus serratus along with Ascophyllum nodosum form the main and dominant seaweeds on rocky shores. These three species, along with two others Pelvetia canaliculata and Ascophyllum nodosum form the zones along the shore. [3]