Charophyta is a phylum of green algae that includes both freshwater and terrestrial species. There are several synonyms that are commonly used to refer to this group of algae, including Chara, stoneworts, and muskgrass. Chara is the most widely recognized synonym and refers specifically to the genus of algae that are commonly found in freshwater habitats. Stoneworts is another commonly used synonym, which refers to the hard calcareous deposits that this group of algae produces. Muskgrass is a lesser-known synonym that refers to the strong, musky odor that is commonly associated with some species of Charophyta. Regardless of which synonym is used, these algae are an important component of many aquatic ecosystems and play a crucial role in maintaining water quality and supporting aquatic life.