Dryopteris tonkinensis C. Christensen, Bull. Mus. Natl. Hist. Nat., sér. 2, 6: 102. 1934; Amphineuron tonkinense (C. Christensen) Holttum; Cyclosorus tonkinensis (C. Christensen) L. J. He & X. C. Zhang; Thelypteris tonkinensis (C. Christensen) Ching.

Plants to 2 m tall. Stipes angular, to 1.2 m; laminae large, pinnate-pinnatifid, narrowly elliptic, 50-80 × ca. 40 cm; lateral pinnae to 30 pairs, 30-40 × ca. 2 cm, pinnatifid, proximal ones subopposite, distal ones alternate, obliquely spreading, abaxially ± with minute golden, spherical glands; veinlets 8-10 pairs per segment. Sori orbicular, in 1 or more lines along each side of costae, usually arranged in 2-5 irregular lines, not close to costules, or attached on proximal pair of veinlets and close to costules; sterile on distal veinlets.

On wet rocks in open forests on limestone mountains; ca. 100 m. SW Guangxi (Longjin) [N Vietnam].