Rhizomes rufous, 1-1.2 cm in diam., bearing roots ventrally and fronds in several dorsal rows, densely scaly; scales brown, lanceolate, ca. 6 × 2 mm, margin toothed. Fronds leathery; stipe stramineous, 10-30 cm, grooved adaxially, decurrent into ridges of rhizome; juvenile lamina simple, shortly stalked, narrowly lanceolate, 20-25 × 1-1.5 cm, base narrowly cuneate, apex acute. Mature lamina pinnate; lateral pinnae 8-15 pairs, 4-6 cm apart, lanceolate, 12-18 × ca. 1.5 cm, shortly stalked, both surfaces glabrous, base cuneate and decurrent, margin entire or slightly undulate, apex acuminate; lamina articulate to rachis, terminal pinna not articulate; upper part of rachis narrowly winged; veins obvious on both surfaces, free, simple or forked, oblique. Fertile lamina narrowly elliptic, similar to sterile lamina but pinnae much contracted; pinnae linear, 10-20 × ca. 0.3 cm, subsessile, articulate. Sori acrostichoid; perispore consisting of many small wings. 2n = 82.
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Lamina of simple fronds of young plants to 30 by 1.2 cm, narrowed gradually to apex; pinnae of first pinnate fronds sessile. Fronds of mature plants 70 cm or more long, pinnae c. 15 pairs. Sterile pinnae of largest fronds commonly 20 by 1.5 cm, rarely to 2.5 or 3 cm wide, lowest with stalks to 10 mm long, apices acuminate (not abruptly narrowed), when dry rigid and brittle, dark olive-green. Fertile pinnae to 25 cm long, 4-5 mm wide, stalked as sterile; spores about same size as those of L. lineata, perispore consisting of many small wings.
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