Marimo
…wind-induced currents, light regime, lake morphology, bottom substrate, and sedimentation. The growth rate of marimo is about 5 mm (0.2 in) per year. In Lake Akan in Japan they grow particularly large, up to 20–30 cm (8–12 in). Lake Mývatn, Iceland, had dense colonies of marimo that grow to about 12 cm (5 in) in…