spirogyra

/ˌspaɪ.roʊˈdʒaɪ.rə/

a type of freshwater algae (= very simple plants) formed of cells that contain a green spiral of chloroplast
水绵（一种淡水藻，由细胞构成的极简单的植物，含叶绿体构成的绿色螺旋圈）