"Sato-meshida" (Athyrium deltoidofrons) belongs to the Woodsiaceae family. It is a summer-green fern that is native to Japan, the Korean Penunsula and China. This fern grows in wettish places of mountains, and it can reach 70-100 cm in height. The petioles are green and turn straw-colored when get old. The leaves are bipinnate compound with 15-20 pairs of pinnae. The pinnae are deltiod-narrow ovate, and have acute tips and partite lobes. The sori are arranged near the rachises, and the indusia are horseshoe to elliptic or j-shaped with fine dissected margins.