Petioles c. 3-15 cm long, 1/5-1/2 as long as the lamina. Lamina 1-3 cm wide, with c. 25-60 pinnules to a side. Larger pinnules 5 by 3 to 15 by 6 mm, almost 2-2.5 times as long as wide, rather variable in shape, 1/4-elliptic or subtriangular if small, ligulate to subtrapeziform or elongate-1/4-elliptic if larger, the apex subacute to broadly rounded, the lower margin +-straight, the upper margin especially in small pinnules evenly convex and no separate outer margin developed, or outward increasingly convex, the outer margin +-distinct. Upper pinnules gradually and suddenly rather strongly reduced, some denticuliform ones connected with the narrow, small, lobed, usually obtuse and often fertile leaf-apex. Lower pinnules not reduced or more often slightly to stronglyand gradually reduced, then often somewhat decurved, in extreme cases only 2 mm long but usually larger, the petiole below them well developed. Sterile pinnules crenate; fertile pinnules if very small entire or with 1 or 2 incisions on the outer/upper margin to 1/2 mm deep, in larger forms rarely entire, mostly at least with one incision of 1/2-1 mm between upper and outer margin, most commonly the upper margin with 1-3 incisions of c. 1 mm (but up to 2 mm), the outer entire. Sori continuous except as interrupted by the incisions, on 2-7 (-10) vein-ends, the outermost usually longer; upper, smaller pinnules entire, fertile; lower, reduced ones, if any, partly or entirely sterile. Receptacle straight, or concave in the outer sorus. Indusium 0.3-0.4 mm wide, little narrowed at the edges, almost or quite reaching the margin, or more strongly intramarginal in the outer sori, reflexed or not at maturity. Spores yellowish brown, smooth, c. 25-28 μ.
Terrestrial or on rocks, rarely epiphytic, in primary forests, from 400-1600 m, sporadically to sea-level.
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