Plants 60-100 cm tall. Rhizome erect, apex scaly; scales medium to dark brown, lanceolate, margin subentire. Fronds caespitose; stipe dull gray-brown to gray-green, semiterete, 20-43 cm, adaxially sulcate, base scaly, becoming subglabrous near rachis; lamina triangular-ovate, 45-70 × 18-35 cm, apex acute, 2-pinnate to 4-pinnatifid; pinnae 16-19 pairs, subopposite to alternate, stalked, basal pinnae slightly reduced, middle pinnae largest, narrowly triangular, 11-19 × 4-8 cm, often slightly falcate, apex acuminate, base asymmetrical, acroscopic side truncate, basiscopic side cuneate, 2-or 3-pinnate; pinnules 8-13 pairs, anadromous, basal pinnules free and stalked, distal pinnae adnate to costa, basal acroscopic pinnule largest, ovate-triangular, 2.5-4 × 1.6-2.2 cm, base cuneate, asymmetrical and often decurrent along costule, apex obtuse to subacute; ultimate pinnules 2-5 pairs, basal acroscopic segment largest, ovate, 12-15 × 6-8 mm, apex obtuse to truncate, base cuneate and decurrent on costule or free, margin dentate, teeth deltoid-triangular and often submucronate. Veins obscure, anadromous, rarely simple with distinct terminal hydathode on adaxial side, not reaching margin. Fronds herbaceous, green; rachis gray-green, semiterete, lamina with 2-4 cellular uniseriate hairs with apical gland or subglabrous, adaxially sulcate but with distinct supravascular ridge; costa pale brown to green, terete-semiterete, adaxially sulcate with distinct supravascular ridge, winged near its apex. Sori 1-25 per pinnule, median on subtending vein, subelliptic, ca. 4 mm; indusia yellowish brown, semi-elliptic, membranous, with thin hyaline margin with short 1-3-celled uniseriate hairs, rolling back at maturity, opening toward costule, persistent.
Home