Rhizome very short-creeping or ascending, c. 1.5 mm ø, with densely scaly apex; scales reddish brown, to almost 2 mm long, narrowly triangular, up to 5-seriate at base, biseriate below the glandulartop-cell. Leaves very close; petioles blackish brown to atropurpureous, hardly shining, sharply triangular to base, with somewhat paler edges, the lateral faces much wider than the adaxial one, 3-10 cm long, much shorter than the lamina. Lamina simply pinnate, linear, c. 15-50 by 2-3 cm, widest mostly somewhat above the middle, with c. 25-40 pinnules to a side; rachis similar to the petiole, dark throughout, the edges often irregular and more pronouncedly pale. Pinnules firmly herbaceous, mostly olivaceous when dry, subopposite almost throughout, spreading, close to overlapping in the upper part, gradually more remote in the lower part of the lamina, sessile; larger pinnules obliquely triangular, often subacute, 9 by 4.5 to 15 by 9 mm; lower margin straight or slightly convex, ascending, upper margin straight or somewhat convex to the apex, with 1-3 narrow, unequal incisions that may reach down to the middle but are usually much shallower; a distinct outer margin not developed; bases of pinnules abruptly non-sclerotic, suggesting an articulation. Lower pinnules gradually very remote, reduced, auriculiform, incised; upper pinnules gradually and strongly reduced, little or not incised, 1 or 2 confluent with the lobed, non-caudate terminal segment. Veins slightly impressed above and prominulous beneath, giving the pinnules a striate appearance, free, once or twice forked, 1/4-3/ apart. Sori one per lobe, on 4-10 vein-ends; receptacle straight, with convex ends; indusium pale, herbaceous, erose, adnate at the sides, 0.6-0.9 mm wide, mostly not quite reaching the margin, scarcely reflexed at maturity. Spores yellowish, trilete, almost smooth, c. 38-41 μ.
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