Acystopteris japonica (Luerss.) Nakai

Japanese: ウスヒメワラビ（英語表記）Acystopteris japonica (Luerss.) Nakai

A delicate and beautiful medium-sized fern that grows in the moist shade of mountain areas; a member of the Melastomataceae family. The rhizome is creeping and the leaves grow close together. The rhizome and petiole have membranous, light brown scales, and the leaves have soft white or light brown hairs. The leaves are 40-80 cm long, with purple-brown petioles and mid-axis, somewhat glossy, relatively thin, and prone to breaking. The leaf blade is ovate-triangular, 3-pinnately divided, bright green, and made of soft, thin grass. The lobes have blunt serrated edges. The sporangia are circular and grow near the margins of the lobes.

Source: Heibonsha World Encyclopedia, 2nd Edition Information

Japanese:

山地の湿った陰地に生える繊細で美しい中型のシダで，メシダ科の1種。根茎は匍匐（ほふく）し，葉は近接してつく。根茎と葉柄に膜質，淡褐色の鱗片がつき，葉には軟らかい白色または淡褐色の毛がつく。葉は全長40～80cm，葉柄と中軸は紫褐色を帯びやや光沢があって，比較的細く，折れやすい。葉身は卵状三角形，3回羽状に分裂し，鮮緑色で，軟らかい薄い草質である。裂片は鈍鋸歯縁。胞子囊群は裂片の辺縁寄りにつき，円形。

出典　株式会社平凡社世界大百科事典第２版について　情報

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