Chlamydomonas is a unicellular, mobile, photosynthetic and autotrophic organism with a pair of terminal flagella. It consists of several kinds, and its shape ranges from nearly round to nearly cylindrical. China, like the rest of the world, mostly lives in fresh water, and most of the time the water is green. Others live in other environments, such as wet soil.

Cyanophyta is a unicellular or multicellular organism with no flagella and photosynthetic autotrophy. From fresh water and seawater to dry soil and rocks, they are distributed from the tropics to Antarctica. Nostoc flagelliforme and auricularia auricula are familiar to us.

Hymenoptera aquatica lives in still water ponds, which can be up to 2 meters long, with branched stems and linear leaves with 4-8 small serrations. There are all over the north and south of our country.