Desmodesmus
Desmodesmus is a genus of green algae in the family Scenedesmaceae. It is the only chlorophyll-containing organism known to have caused human infections in immunocompetent individuals. All known cases involved open injuries occurring in fresh water. Description
Desmodesmus consists of colonies of two, four, eight or 16 cells arranged in a row. Cells are ellipsoidal to ovoid, joined to each other by their longer sides. The terminal cells of a colony (and sometimes the medial cells as well) are usually armed with spines. Cell walls may also be covered in ridges, warts, and net-like structures. Cells contain one parietal chloroplast, containing one pyrenoid. Habitat
Desmodesmus is found in the plankton of habitats such as ponds and lakes, particularly in eutrophic waters. It is one of the most common types of freshwater plankton. References

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Sphaeropleales genera
Sphaeropleales
Freshwater algae