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The "Namera-inode" (Polystichum x okanum) belongs to the family Dryopteridaceae. It is an evergreen fern that is distributed from the Kanto region in Honshu westward to Shikoku and Kyushu in Japan. It grows in the forest floor of low mountains. It is an interspecific hybrid between "Inode-modoki" (Polystichum tagawanum) and "Sakage-inode" (Polystichum retroso-paleaceum). The leaves are bipinnate compound, green to light green in color, dull in luster, and of a slightly thick texture. The scales at the base of the petiole are ovate to long ovate-elliptic in shape and light brown in color. The sorus is attached near the margin of the pinnules. The Japanese name is said to come from the fact that it was discovered on the mountain named Namera-yama in Tokuji, Yamaguchi City, or from the smooth surface of the leaves.
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