Rhizome terete, 5-10 mm thick, brown; phyllopods 2-3 cm distant. Anatomy: vascular strands 10-17, with dark bundle sheaths, sclerenchyma strands many (40-50). Rhizome scales inserted evenly, deciduous, densely set, appressed, pseudopeltate, monomorphic, deltoid, 1.8-5 by 0.8-2 mm, index 2.2-3.3, basal auricles rounded, margin set with 1-or 2-celled glands, short-dentate, teeth all equally long or slightly longer at base, apex acuminate, cell walls equally clathrate throughout, superficial rhizoidal indument present, spread over the acumen. Fronds pinnate, stipe 3-4.5 mm thick, 0.5-0.7 0 as long as the lamina, glabrous; lamina 35-60(-150) by (14-)20-38 cm, index 1.5-3.9, widest at the base; pinnae articulate, mostly distinctly petiolate, 20-22 by 2-2.5 cm, index 8.8-10, base angustate, margin entire to crenate, apex acuminate; basal pair 3-6 cm distant from the next pair and equally long, not deflexed, apical segment conform, equally long as or slightly longer than longest pinnae. Venation: areoles 2-4-serial, marginal veinlets up to 1/3 as long as the areole, simple or forked, frequently anastomosing. Indument: 2-celled glandular hairs present, acicular hairs usually absent, sometimes sparsely present on costa and veins on lower surface, scales deciduous. Sori uniserial, costal, slightly sunken, 1.8-2.2 mm diam., receptacular scaly paraphyses deciduous, clathrate, 90-110 by 60-80 µm, 2 or more cells wide. Sporangia glabrous. Spores yellow, cristate, with short polar excrescences.
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Rhizome green or brown, 5-7 mm in diam., densely scaly; scales dark brown, ovate-lanceolate, 3-4 × 1.5-2 mm, margin toothed. Stipe straw-colored or brownish, 30-40 cm, 3-4 mm in diam., densely scaly at base, distally minutely scaly or glabrescent upward. Lamina broadly lanceolate in outline, up to 150 × 40 cm; lateral pinnae 10-30 pairs, ascending, 4-5 cm apart, ± falcate, linear-lanceolate, up to 20 × 2.5 cm, cuneate at base, with 5-7 mm stalks, margin toothed and cartilaginous, apex caudate-acuminate; pinnae gradually smaller distally, terminal pinna same as lateral pinnae, up to 15 cm; lamina herbaceous or subleathery, green, glabrous. Sori orbicular, borne on simple included veinlets in costal areoles, in 1 row on each side of costa, medial or costular, distinctly sunken on abaxial surface and raised on adaxial surface.
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