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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
Division: Chlorophyta
Family: Pithophoraceae
Genus: Aegagropila; Kützing