Ascophyllum nodosum Thallus Source & Identity
The botanical entity is Ascophyllum nodosum (L.) Le Jol., a brown alga of the class Phaeophyceae that grows on sheltered intertidal rock in the North Atlantic. The part used is the thallus, the entire frond body. It has a single air bladder along each frond, which sets it apart from related wracks.
Fucus vesiculosus, bladderwrack, has paired air bladders and is a separate species. Kelp such as Laminaria is a different order. Seaweed names get mixed up on commercial lists, so the species on the specification is the safest identification.
Brown seaweeds of this kind are characterised by alginate, sulfated fucose polysaccharides, mannitol and polyphenols.












