Description from Flora of China
Lastrea falciloba Hooker, Hookers J. Bot. Kew Gard. Misc. 9: 337. 1857; Aspidium falcilobum (Hooker) Hooker; Cyclosorus falcilobus (Hooker) L. J. He & X. C. Zhang; Dryopteris falciloba (Hooker) C. Christensen; Glaphyropteris falciloba (Hooker) H. Itô; Nephrodium falcilobum (Hooker) Hooker; Thelypteris falciloba (Hooker) Ching.
Plants 65-80 cm tall. Rhizomes erect, woody, apices and bases of stipes with brown lanceolate scales. Fronds clustered; stipes 6-10 cm, bases dark brown, distally stramineous, glabrous; laminae lanceolate, 60-70 × 14-18 cm, proximally abruptly narrowed, pinnate-pinnatifid, pinnatifid-acuminate at apices; proximal 3-6 pairs of pinnae reduced into small auricles, middle normal pinnae 36-38 pairs, very oblique distally, alternate or subopposite, sessile, linear-lanceolate, 12-13 × 1-1.2 cm, cuneate at bases, pinnatifid nearly to costae, long acuminate at apices; segments 22-25 pairs, falcate-lanceolate, oblique distally, 5-7 × 2-2.5 mm, entire, acute at apices; basal acroscopic one particularly elongated to 1 cm. Veins visible adaxially, costules raised on both sides, veinlets extremely oblique distally, 9 or 10 pairs per segment, proximal pair arising from base of costule, acroscopic veinlet reaching bottom sinus, basiscopic one reaching margin above sinus. Laminae dark green when dry, papery; abaxially with acicular setae along rachises, costae, and veins, glabrous on intercostal areas, adaxially with appressed setae along grooves of costae and veins, margins subglabrous. Sori orbicular, attached on middle of veinlets; indusia orbicular-reniform, thick, brown, glandular, persistent.
On rocky soil at watersides in valleys; 300-1100 m. Fujian, Guangdong, Guangxi, Hainan, S and SW Yunnan, Zhejiang [India, Japan, Laos, Myanmar, Thailand, Vietnam].