Ectocarpus is brown marine algae, it can grow up to 30 cm. They have a branched structure and a small ball-shaped appearance. Their thallus is differentiated into the prostate and erect system. It helps to understand the genetic polymorphism that acts as a molecular marker. Their cell is rectangular and covered by a thick cell wall. Pyrenoid-like bodies are also present. Laminarin and mannitol are reserved food materials and are uninucleated. Chromatophores are of various shapes such as discoid, ribbon-shaped, etc.