Spiral Wrack (Fucus spiralis) is a brown algae which can be found in intertidal zones due to its high tolerance to desiccation. It has smooth edges and a ridge running down the center of the fronds which can split many times and are often twisted, which is where it gets its name. It doesn't have bladders but can have reproductive sacs on the end.
The Phaeophyceae or brown algae (singular: alga), is a large group of mostly marine multicellular algae, including many seaweeds of colder Northern Hemisphere waters. They play an important role in marine environments, both as food and for the habitats they form. For instance Macrocystis, a kelp of the order Laminariales, may reach 60 m in length, and forms prominent underwater forests. Another example is Sargassum, which creates unique habitats in the tropical waters of the Sargasso Sea....