Marimo are a unique growth form of lake algae and used to be found in cold lakes in Japan and Northern Europe. However, the only place where specimens larger than 20 cm in diameter can now be found is ...

Moss balls, lake balls, Cladophora balls, marimo: Whatever you call them, they’re strange — and they’re beautiful. These mysterious green orbs occupy cool lakes in the Northern Hemisphere in places ...

A researcher takes samples of algae filaments from the marimo ball. The ball is made up of green algae throughout and doesn’t have a different material at its core.

Rising lake water temperatures threaten the survival of marimo, unique algal balls found only in cold lakes. Researchers clarified that the warmer it gets, the more the inward decomposition outpaces ...