形态特征：Rhizomes stramineous, 0.7–1.2 cm in diam., densely scaly; rhizome scales brown (but blackened at point of attachment), lanceolate, ca. 4–9 × 1.5–3.7 mm. Fronds 1-pinnate, leathery, mature laminae pinnate, dimorphic. Sterile fronds 30–60 cm long, stipes stramineous, 10–20 cm, grooved adaxially, base with scattered scales, lateral pinnae 3–9 pairs, lanceolate, widest in the lower third, 7–16 × 1.5–1.7 cm, apex acuminate; pinna bases cuneate and decurrent, margins entire; lateral pinnae articulate to rachis, swollen ring on abaxial articulation, terminal pinna with a similar size as lateral pinnae, not articulate; upper part of rachis narrowly winged; veins free, simple or furcate, oblique, not extended to margin. Fertile laminae similar to sterile laminae but pinnae much contracted; pinnae linear, 10–20 × ca. 0.2 cm, equilateral, stalks 0.5–1.1 cm, pinna rachis articulate. Sori acrostichoid. Spores 32 per sporangium, perine with cristae.
