Ulva is a genus of green algae found throughout the world, including in freshwater systems. It belongs to the family Ulvaceae, which is comprised of a number of different species. Synonyms for Ulvaceae include Enteromorpha, in reference to its tubular or intestinal-like appearance, and Monostroma, which refers to the algae's simplicity and single-cell structure. Other potential synonyms for Ulvaceae could include sea lettuce, which represents one of the most commonly recognized algae species within the family. Regardless of their name, these algae play an important role in aquatic environments, serving as a food source for a wide range of marine life.