"Iwa-hego" (Dryopteris cycadina) belongs to Polypodiaceae (the Polypody family). It is an evergreen fern that is native from southern Tohoku district of Honshu to Shikoku and Kyushu, as well as China, Taiwan, India and the Hymalayas. This fern grows in forest floors and edges on low mountain to mountain, and it can reach 50-120 cm in height. The leaves are ob-lanceolate to oblong-lanceolate, green and papery. The pinnae are linear, 20-30 pairs and have lobes or coarsely toothed edges. The petioles are 25-50 cm long, and bear black-grown to balck scales. The sori are scattered evenly on pinnae.