Freshwater algae

Polytomella is a genus of green algae in the family Dunaliellaceae. It is widespread in freshwater habitats worldwide. The algae is actually colourless. It has discarded the ability of photosynthesis, and lives by consuming compounds like acetate, butyrate, and alcohols. Thus, it's one of the rare examples of non-photosynthetic algae.

Golenkinia is a genus of green algae first described in 1894 by Robert Chodat. The genus is named for the Russian phycologist Mikhail Iljitsch Golenkin. Golenkinia species live in fresh water (including bodies of black water such as Winyah Bay) and are found around the world.

Lanceola is a genus of green algae in the family Characiaceae, containing a single species, Lanceola spatulifera. It is found in freshwater habitats.

Pseudochaete is a genus of green algae, in the family Chaetophoraceae. However, this genus is not recognized by all authorities, sometimes being considered part of genus Stigeoclonium.

Mychonastes is a genus of green algae, specifically of the Chlorophyceae. It is the sole genus of the family Mychonastaceae.

Selenastrum is a genus of green algae in the family Selenastraceae. It is common in freshwater habitats around the world. Most species prefer temperate or warm-temperate waters.

Gloeotila is a genus of green algae in the class Trebouxiophyceae. It is typically found in freshwater habitats, either attached to surfaces or planktonic, or found in soil.