Pithophoraceae

Marimo (also known as Cladophora ball, moss ball, moss ball pet, or lake ball) is a rare growth form of Aegagropila brownii (a species of filamentous green algae) in which the algae grow into large green spheres with a velvety appearance.

Pithophoraceae is a family of green algae in the order Cladophorales.

Aegagropila is a genus of green algae in the family Pithophoraceae. It is found in freshwater habitats in across the Northern Hemisphere.

Pithophora is a genus of green algae in the family Pithophoraceae. Molecular evidence suggests it contains a single species, Pithophora roettleri. AlgaeBase accepts another species, Pithophora inaequalis.