Hokkaido’s Lake Akan has been declared a national park in order to safeguard the lake's marimo colony. The marimo themselves are bigger than basketballs and hundreds of years old. More than ...

Scientists have solved a long-running mystery surrounding marimo, the fuzzy balls of green algae that Japan considers a national treasure. Though marimo are known for nestling adorably at the ...

Climate change could overexpose rare underwater "marimo" algae balls to sunlight, killing them off according to a new study at the University of Tokyo. Marimo are living fluffy balls of green algae.

KUSHIRO, Hokkaido—“Marimo” moss balls, the fuzzy green spheres that have brought fame to Lake Akanko here, are shrinking because of global warming, a research group found. The maximum ...

TAKAYAMA, Gifu Prefecture--Officials are trying to give the struggling area here a boost through sales of a more durable “marimo” moss ball that forms in hot spring water used to cultivate ...