Abacopteris longipetiolata K. Iwatsuki, Acta Phytotax. Geobot. 18: 11. 1959; Cyclosorus longipetiolatus (K. Iwatsuki) C. M. Kuo; Thelypteris longipetiolata (K. Iwatsuki) K. Iwatsuki.

Plants 30-50 cm tall. Rhizomes long and decumbent, with dense hooked hairs and scales; scales narrowly triangular-lanceolate, sparsely hairy on surface and margins, acuminate at apices. Fronds remote; stipes 10-30 cm, stramineous, with hooked hairs, bases slightly scaly; laminae subdimorphic, oblong to ovate-oblong, 15-20 × 9-14 cm, imparipinnate; terminal pinna very large; lateral pinnae 2-4 pairs, oblong to lanceolate, 5-9 × 1.5-2 cm, bases rounded-cuneate, obviously shortly stalked, margins entire or irregularly undulate, apices acuminate to shortly caudate-acuminate; terminal pinna oblong-lanceolate, 9-13 × 2.5-4 cm, usually not symmetrical, long stalked, shortly caudate-acuminate at apices; rachises and costae with sparse hooked hairs on both sides. Veinlets not obviously raised abaxially and slightly oblique distally, veinlets forming areoles and spreading an excurrent veinlet from joining point. Sori attached on middle of veinlets, confluent when mature, exindusiate, hooked-hairy on sporangia.

● Forests; 200-500 m. S and SE Taiwan.