Bladderwrack

Bladderwrack, also bladder wrack, is common seaweed. This brown shoreline seaweed grows on the northern Atlantic and Pacific coasts of the United States and Atlantic and Baltic coasts of Europe. It has tough straplike fronds. It keeps afloat because of its fronds contain air bladders. It is known for its medicinal value. Fucus vesiculosus is its botanical name, and it belongs to the class Phaeophyceae.