1) Family zygnemataceae 2) Protoctist family 
The Zygnematacae are a family of filamentous or unicellular, uniseriate (unbranched) green algae. The filaments are septated and reproduction is by conjugation; Spirogyra is commonly used in schools to demonstrate this kind of reproduction. The family is notable for its diversely shaped chloroplasts, such as stellate in Zygnema, helical in Spirogy...
[n] - pond scums: common freshwater algae forming green slimy masses
family Zygnemataceae noun pond scums: common freshwater algae forming green slimy masses