large division of chiefly freshwater eukaryotic algae that possess chlorophyll a and b,store food as starch,and cellulose cell walls; classes Chlorophyceae,Ulvophyceae,and Charophyceae; obviously ancestral to land plants.

• 主要是淡水真核状态的藻类的一个大门，具叶绿素A和B，储备食物作淀粉、纤维素细胞壁；绿藻纲和轮藻纲；明显地祖先陆地植物。