Charophyceae is a group of green algae that contains various species. There are several synonyms for the term "Class Charophyceae," including Charales, stoneworts, stoneweed, and Charophyta. These synonyms can be used interchangeably to refer to the same group of algae in scientific and academic contexts. Charales are known for their unique morphology, which includes branched and multinucleated cells. Stoneworts, on the other hand, are characterized by their calcified structures, making them important in paleontology. Despite the differences in terminology, all of these synonyms refer to the same group of green algae that play a crucial role in freshwater ecosystems.