Rhizome short-to moderately long-creeping, l.5-2.5 mm ø; scales reddish to dark brown, lustrous, acicular, to 1.5 mm long, uni-or biseriate or sometimes triseriate at the base. Leaves close or not; petioles reddish brown to fuscous, rarely blackish, rather dull, abaxially terete, adaxially upwards (sometimes pale) bimarginate, 5-25 cm long, much shorter than to about equaling the lamina. Lamina linear, 10-30 cm long, 1.5-3.5 cm wide, with up to c. 30 pinnules to a side; rachis medium to dark reddish brown, rarely blackish, dull, abaxially terete at the base, upwards gradually carinate, occasionally the keel extending to the base or present only near the apex, sometimes pale, adaxial side ± distinctly pale-margined. Pinnules chartaceous to coriaceous, usually drying brown, spreading or slightly upcurved, 0.5-l times their width apart or less often contiguous, the lower ones remote, not reduced, the upper ones gradually reduced, the smallest c. 1 or 2 mm long, connected with the small lanceolate terminal segment. Larger pinnules 7-18 mm long, 3.5-8 mm wide (excluding basal auricles), asymmetrically ovate, 2-2.5 times as long as wide, obtuse to broadly rounded or rarely subacute, the acroscopic side of the base mostly with a small but distinct auricle often touch-ing the rachis; articulation at the bases of the pinnules distinct. Veins immersed, obscure, once or twice forked, free; costa evident, not percurrent. Margin entire in fertile, crenate in sterile pinnules. Sori continuous, or absent from the pinnule-apices, always absent from the base of the lower margin; indusium rigid, subentire, 1/3-1/2 mm wide, almost or quite reaching the margin, scarcely reflexed at maturity. Spores medium brown, trilete, almost smooth, c. 25-30 μ.
Home