Lindsaea obtusa J.Sm. ex Hook.

Rhizome short-creeping, 1-2.5 mm, usually 1.5 mm ø; scales medium brown, narrowly triangular, to 134 mm long, to 4-seriate at base, with a rather short uniseriate apex. Leaves close (less so in epiphytic plants); petioles stramineous or in mature specimens mostly medium to dark brown or blackish, sometimes pale-margined or mottled, ± sharply quadrangular and mostly somewhat sulcate, c. 10-30 cm long, 1/2 as long as to equaling the lamina. Lamina simply pinnate or in full-grown plants mostly bipinnate, with 1 or 2, less often with 3 pairs of pinnae (very rarely the basal pinnae forked) and a conform terminal one; primary rachis like the petiole. Pinnae mostly subopposite, obliquely ascending, 10-20 cm long, 1.5-3 cm wide (simply pinnate laminas may be wider), widest in the lower half, gradually and strongly narrowed to the usually long-acuminate apex; secondary rachises abaxially bi-angular, mostly distinctly sulcate, usually pale. Pinnules herbaceous to chartaceous, mostly rather dark when dry, c. 20-35 to a side, mostly distinctly ascending, close but hardly contiguous, the basal ones of simply pinnate leaves often more remote, ligulate to subtrapeziform, the larger ones 10-16 mm long and 5-7 mm wide, nearly always slightly over twice as long as wide, narrowed from the base to the broadly rounded or subtruncate apex, less often of almost equal width from base to apex, the upper margin straight at the base, outward convex. Upper pinnules gradually and strongly reduced, mostly some denticuliform ones present below the cre-nate-pinnatilobate pinna-apex. Upper and outer margins of pinnules incised, mostly with 3-5 narrow, oblique incisions usually less than 1 mm (but in extreme cases to 2 mm) deep; margin otherwise minutely but distinctly crispate and/or erose. Lobes of fertile pinnules, especially the inner ones, flat, truncate, not convex. Veins immersed and often obscure, mostly twice forked, regularly anastomosing, forming one or sometimes towards the apex of the pinnule two series of areoles; larger areoles to 1 mm wide. Sori interrupted by the incisions, variable in size, the innermost one often quadrinerval, the outer ones bi-or trinerval, but often on more or fewer vein-ends. Indusium subentire or, if broader, often erose, very variable in width, 0.2-0.7 mm wide, not reaching the margin by 1/2-l times its width, bulging but hardly reflexed at maturity. Spores pale yellowish, trilete, smooth, c. 24 μ.

In primary forest, often on banks, on rocks, by or on tree bases, from sea-level up to 2000 m, mostly below 1500 m.