Marimo
Algae
Marimo is a rare growth form of Aegagropila linnaei in which the algae grow into large green balls with a velvety appearance.
The species can be found in a number of lakes and rivers in Japan and Northern Europe. Colonies of marimo balls are known... Wikipedia
Scientific name: Aegagropila linnaei
Growth rate: about 5 mm per year
Class: Ulvophyceae
Division: Chlorophyta
Family: Pithophoraceae
Genus: Aegagropila; Kützing
Order: Cladophorales