Description from Flora of China
Rhizome slender, short creeping or ascending; scales dark brown, lanceolate, 3-5 mm, ca. 0.5 mm wide at base, apex long acuminate, margin minutely denticulate, clathrate. Fronds clustered; stipe with wings; lamina leathery, oblong-lanceolate, 10-20 × 1.5-3 cm, widest at middle or above, apex acute, base long attenuate; costa indistinct; veins abundantly reticulate. Soral lines slightly immersed, netted; paraphyses taeniform. Spores trilete, tetrahedral-globose, surface papillate.
Antrophyum formosanum and its relative A. henryi both have taeniform paraphyses, but the latter is much smaller with soral lines not anastomosing.
On wet rocks by streams in forests; below 1300 m. Taiwan [Japan (Ryukyu Islands)].