Large-leaved Fern - Large-leaved Fern

Japanese: オオクボシダ - おおくぼしだ

A small evergreen fern of the Polypodiaceae family that grows on tree trunks and rocks in mountainous areas; in Japan, it rarely grows to be over 10 cm in size (illustration). The rhizome is short, ascending, brown, membranous, lanceolate, and bears scales about 2 mm long. The leaves are clumpy, with short petioles covered in reddish-brown pubescence. The leaf blade is linear-lanceolate and deeply pinnately lobed. The veins are simple or have one or two branches on the upper side. The sporangia are elliptical, with one at the base of the pinna, and lack an intumescent membrane. It is distributed from southern Kanto to the west, from the warm-weather zone of Honshu to Shikoku and Kyushu, and is also found in the high mountains of Taiwan.

Source: Heibonsha World Encyclopedia, 2nd Edition Information

Japanese:

山地の樹幹や岩上に生じるヒメウラボシ科の常緑性の小さなシダで，日本のものでは大きさが10cmをこえることはまれである（イラスト）。根茎は短く，斜上し，褐色，膜質，披針形で，長さ2mmくらいの鱗片をつける。葉は叢生（そうせい），葉柄は短く，赤褐色の開出毛をつける。葉身は線状披針形，羽状に深裂する。葉脈は単生，または上側に1～2個の支脈をつける。胞子囊群は楕円形，羽片の基部に1個あり，包膜はない。関東南部から西，本州の暖帯から四国，九州に分布し，台湾の高山にもある。

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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