Japanese name: ゲジゲジシダ（蚰蜒羊歯） Scientific name:Thelypteris decursivepinnata
[Overview]
A summergreen fern commonly seen in hills and low mountains.
The rhizome is short, ascending, and bears scales.
The leaves are lanceolate, 30–50 cm long and 5–13 cm wide, simply pinnate or deeply 2-pinnately divided.
The pinnae are linear-lanceolate and deeply divided or almost completely divided.
The lobes are elliptic, and the lowest lobes run down along the rachis and become wing-like.
Both surfaces of the leaf are hairy.
The sori are borne midway between the midrib and the margin of the lobes; they are round to elliptic and have no indusium.
The sporangia are hairy.
The petiole is 5–25 cm long and straw-colored, with rather dense scales and hairs.
The base of the petiole bears brown scales.
The surface of the spores has wart-like projections.
