"Ryu-bintai" (Angiopteris lygodiifolia) belongs to the family Marattiaceae. It is an evergreen fern that is distributed to the Black Current washed coastal areas of Honshu, Shikoku and Kyushu, the archipelago in Japan and Taiwan. This fern grows in humid canyons and forest floors, and up to a height of 1-2 m. The fronds are bi-pinnate compound, with 5-10 pairs of pinnae, with 15-25 pairs of lancelate pinnules. The sori are aligned in two rows near the edges of the pinnules. The Japanese name is said to be similar to the dragon scales of the overlapping shape of the stipules on ball-shaped tuber.