Quadrigula

Quadrigula is a genus of green algae in the family Selenastraceae.

[2] It is commonly found in freshwater habitats as phytoplankton.

[3] Quadrigula forms colonies of two, four, or cells within a common mucilaginous envelope.

The tips of the cells are rounded or acutely pointed.

[3][1] Species identification relies on details of the cell size and shape.