Description:
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Rhizome erect, dark brown; rhizome scales mid- to dark brown, up to 5.5 x 0.8 mm, linear in outline, apex gradually tapering to a slender point, margin entire. Fronds tufted, erect, not proliferous, herbaceous. Stipe dark brown, purplish or black, 3–30 cm long, base with scales similar to those of the rhizome, otherwise glabrous. Lamina membranous, delicate, bright green, ovate to lanceolate in outline, 10–40(–70) x 5–20 cm, 3-pinnate, the lowermost pinnae reduced, decrescent towards the apex. Pinnae mid-green, narrowly triangular in outline, up to 11 x 3.5 cm, unequally wedge-shaped at base, apex gradually tapering to a slender point. Pinnules ovate or rhombic-ovate in outline, lobed to pinnate, ultimate segments obovate in outline, apices rounded to obtuse, glabrous or with sparse scales to 0.1 mm long. Rhachis brown with thin green wings, hairless or nearly so. Sori 1–2 per segment, on the veins and facing towards the costule, ovoid, 0.5–2 mm long; indusium half-circular, membranous, entire, 0.7–1 mm wide. |