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Life / Eukarya / Plantae / Viridiplantae
Chlorophyta (Enteromorpha, Codium, Chlorella, Chlamydomonas etc.)
"Chlorokybophyceae" (Chlorokybus, Spirotaenia?)
"Klebsormidiophyceae" (Klebsormidium, Entransia)
Zygnematophyceae (Spirogyra, Closterium, Cosmarium etc.)
Coleochaetophyceae(Coleochaete, Chaetosphaeridium
Charophyceae (sensu stricto) (Chara, Nitella, Nitellopsis etc.)
Embryophytes (land plants)(mosses, ferns, seed plants etc.)
1. Streptophytes

The Viridiplantae (green plants) is a large group including the most familiar photosynthetic organisms, land plants. Organization is variable, such as unicellular, colonial, multicellular and coenocytic. Habitat is also variable from marine, freshwater to land. Most green plants are autotrophic but heterotrophic species are also present (Prototheca, Polytoma, Rafflesia etc.). Some heterotrophic species damage crops and human. The land plants include very important organisms such as rice, wheat, barley, corn, potato, soybean, tea and cotton. The green plants except for land plants (green algae) are also sometimes used economically (e.g. Chlorella, "Enteromorpha").

The Viridiplantae possess the plastid enclosed by two membranes. Main photosynthetic pigments are chlorophyll a and b, thus they usually show greenish color. Thylakoids stack sometimes to form grana. Storage polysaccharude is starch synthesized in the plastid. Cells are naked or covered by organic scales or cell wall (cellulose, glycoprotein etc.). Flagellate cell usually possess two or four isokont and isodynamic flagella inserted apically. Transition region of flagellum include the stellate stracture. Each basal body is associated with two microtubular roots, one of which (s-root) shows the positional change of microtubule.

1: Pediastrum (Chlorophyta, NIES-211). 2: Botryococcus (Chlorophyta, NIES-836). 3: Closterium (Zygnematophyceae, NIES-228). 4: Lotus (Embryophyes).