Coniogramme japonica (Thunb.) Diels

Stipe straw-colored or chestnut-brown, 30-50 cm × 3-5 mm; lamina oblong-deltoid or ovate-deltoid, 20-40 cm wide, 2-pinnate, papery or herbaceous when dry, both surfaces glabrous. Lateral pinnae usually 3-5 pairs, basal pair largest, ovate-deltoid, 20-35 × 10-15 cm, stalks 1-2 cm, pinnate (occasionally bifurcate); lateral pinnules 1-3 pairs, lanceolate or broadly lanceolate, 8-15 × 1.5-3.5 cm, stalked or distal pinnules sessile, base cuneate, rounded, or rarely cordate, apex acuminate, long acuminate, or shortly caudate; terminal pinnule broadly lanceolate, 20-28 × 2.5-4 cm, usually attenuate toward base. Pinnae of second pair trifoliolate, bifurcate, or simple; simple pinnae as terminal pinnule. Pinna or pinnule margins serrate, teeth sparse and short. Veins anastomosing to form 1-3 rows of areoles along each side of midrib, then free to margin; hydathodes spindle-shaped, extending below base of teeth. Sori extending nearly to lamina margin.

Woods in low mountains of central and southern Japan. Grows on the floor of dense forests. Forests or shade and moist soil in ravine at elevations of 100-1300 metres.

The fronds or leaves are cooked as a vegetable. The rhizomes are used for starch to make noodles.