Green Algae

Green algae are a group of chlorophyll-containing autotrophic algae belonging to the clade Viridiplantae, encompassing roughly 22,000 species ranging from unicellular organisms to macroscopic seaweeds. They are bright green from chlorophyll a and b, have cellulose-based cell walls, and store carbohydrates as starch, showing remarkable diversity in form, from single-celled flagellates to colonial, filamentous and highly differentiated multicellular seaweeds. They inhabit both freshwater and marine environments, and some live on rocks, soil and tree bark, often in symbiotic partnership with fungi as lichens.