Rhizome c. 2 mm ø; scales honey-coloured to medium brown, to over 20-seriate at the broadened base but usually narrower, to 3.5 by 1 mm. Petioles to 5 cm long but usually much shorter, less than 1 cm. Lamina 20 by 2 to 70 by 6 cm, with c. 40-80 pinnules to a side, rather suddenly, shortly, and strongly narrowed at both ends. Pinnules sessile, spreading, or slightly ascending or the basal ones somewhat falcately decurved, 15 by 4 to 28 by 8 mm, 3-4 times as long as wide, rarely less. Margins little convex except if pinnules falcate, the outer margin rounded, subtruncate, or virtually absent. Colour mostly dark green when dry. Incisions of upper/outer margin 1/3 to 1.5 mm deep, occasionally deeper, mostly progressively deeper from base to apex, reaching almost to the level of the receptacle to considerably beyond; lobes regular, rounded or narrowed-rounded, often 1 mm wide. Basal pinnules reduced, often decurved, sterile, not rarely deeply pinnatifid. Veins single or rarely paired in the lobes. Sori on one, or on two connivent vein-ends (rarely a few 011 two more divergent vein-ends, then more elongate and the lobe subtruncate), roundish, distinctly intramarginal even in more deeply incised pinnules; indusium with concave base, reniform or subhippocrepiform, pale, entire, 0.4-0.8 mm long, 0.2-0.3 mm wide, not reaching the extremity of its lobe by its own width or more.
On trees, rarely epilithic, in moist forests, from sea-level up to c. 1800 m.
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