Covering over 70% of Earth's surface, the oceans are home to countless life forms that maintain ecological balance and support human well-being. Among these, brown algae (Phaeophyceae) play a crucial role in sustaining coastal habitats, supporting marine biodiversity, and combating climate change through carbon capture. While they have long captured the interest of the scientific world, the genomic and evolutionary history of these organisms has remained largely unexplored.