See text Tetracystis is a genus of green algae, in the family Chlorococcaceae.

[1] It is a terrestrial genus typically found in soils.

The cell wall is thin or thick, and may be thickened at the one or both poles.

The single chloroplast is cup-shaped but often dissected or lobed into many fine rays; the chloroplast has a single pyrenoid in the center, surrounded by starch grains.

[2] Tetracystis reproduces asexually by the formation of biflagellate zoospores, aplanospores, or autospores.