Rhizome forming an erect trunk. Fronds dimorphic (fertile fronds narrower and slightly shorter), 20–80 (–140) cm long, 3–12 (–21) cm wide. Stipe 2–24 cm long, purplish black to dark reddish brown; scales acuminate, entire, dark brown to black, sparse; scales and appressed hairs on distal part of stipe. Lamina oblong-lanceolate to ovate, mostly pinnate, pinnatisect near apex, with 23–65 pairs of pinnae; rachis and costae purplish black and glossy especially on lower surface, becoming stramineous towards apex and on upper surface, glabrous at maturity or with small entire often bullate, sometimes bicolorous scales and fine often appressed hairs; sterile pinnae narrowly linear-triangular, evenly tapering to apices, 2–10.5 cm long, 5–10 mm wide, adnate; margins entire; basal pinnae shorter and more obtuse; fertile pinnae linear, 3.5–5.3 cm long, 1.5–4 mm wide. Spores 51 × 35 µm; perine alate-costate, granulose-scaberulous within; exine smooth, scaberulous to granulose.
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