Description from Flora of China
Plants epiphytic, small to moderate-sized. Rhizome creeping, dark brown, dictyostelic, densely scaly; scales rufous, lanceolate or ovate-lanceolate. Fronds distant, long stipitate; stipe grooved adaxially, sparsely scaly at base; lamina pectinately pinnatisect, lanceolate in outline, subleathery, both surfaces glabrous; pinnae adnate, oblong, margin entire, apex subacute or obtuse; lower few pairs of pinnae shorter; veins anastomosing with 1-3 rows of areoles. Sori linear, forming coenosori adjacent and parallel to costa; indusium attached to commissure, facing toward costa. Spores elliptic, with perispore.
Blechnidium is most closely related to Struthiopteris and isolated from the rest. It is included within Blechnum by Christenhusz et al. (Phytotaxa 19: 34. 2011).
One species: China, India, Myanmar.
(Authors: Wang Faguo (王发国), Xing Fuwu (邢福武); Masahiro Kato)