Lindsaea walkerae Hook.

Rhizome rather short-to long-creeping, 1.5-2 mm ø; scales reddish brown to castaneous, almost linear, to 2 mm, to 4-seriate at base, there usually with laterally projecting cell partitions, the apex uniseriate, paler. Leaves rather close to 4 cm apart; petioles dark castaneous to black, lustrous, abaxially rounded, adaxially flattened or broadly sulcate, c. 10-45 cm long, much shorter to longer than the lamina. Lamina narrowly oblong, 15-70 cm long, 1.5-20 cm wide, simply pinnate, with 3-17 pinnules to a side and a free terminal one; rachis like the upper part of the petiole. Pinnules chartaceous to rigidly coriaceous, mostly olivaceous or dark brown when dry, paler beneath, subsessile, obliquely to very strongly ascending, a few cm apart, opposite or sub-opposite throughout, linear, 2.5-15 cm long, 4-8 mm wide, 6-20 times as long as wide; lower pinnules often more remote and sometimes slightly shortened; upper pinnules little or not reduced. Base of pinnules slightly unequally cuneate, the basiscopic side narrower, the dark colour of the rachis ending rather abruptly in the stalk-like base, but without an articulation; margin entire, somewhat revolute; upper half of pinnule narrowed, obtuse, if acuminate the tip still obtuse. Terminal pinnule conform, Symmetric, occasionally joined to an upper lateral one or lobed at base, usually soriferous. Costa distinct, abaxially elevated, almost percurrent. Veins elevated on both sides, very oblique, less so towards their apices, 2-3 times forked, close, 1/4-1/2 mm apart, free. Sori continuous, extending around the apices of the pinnules, the vein-ends below the receptacle thickened; indusium rigid, yellow or brown, entire, 0.4 mm wide, almost reaching the margin, somewhat reflexed at maturity. Spores dark brown, trilete, smooth, 25-30 μ.

In moist, open places, often on poor, acid soil, in swamps and by streams, at low elevation, but in Malaya also at 1000-1200 m.