Rhizome (1/2-)3/4-1.25 mm ø; scales often a little longer and broader than in var. pulchella. Petioles 1-10 cm long, 1/2-2/3 mm ø, dark reddish brown or upward pal er, hardly pale-margined, adaxially flattened, upward sulcate, abaxially bi-angular except at the rounded base. Lamina 5-30 cm long, 1-2.5 cm wide; rachis quadrangular, at least adaxially sulcate, stramineous or with darker base, wiry. Pinnules herbaceous, mostly olivaceous-brown when dry, c. 20-50 to a side, usually a little ascending, mostly not contiguous, asymmetrically ovate to 1/4-elliptic, 7-12 mm long, 3.5-6 mm wide, twice as long as wide or slightly less; margins not or little sclerotic, a distinct outer margin usually not or scarcely developed, the upper margin with 1-3 oblique major incisions 1-3 mm deep, reaching 1/3 to 1/2 (rarely to 2/3) down, sometimes with some shallower additional incisions; lobes convex, not rarely erose, ± divergent. Basal pinnules farther apart but scarcely reduced; upper pinnules gradually reduced, as in var. pulchella. Veins immersed, not evident, simple or once forked, free, ending well within the margin, 0.5-1 mm apart. Sori uni-or binerval or less often to 5-nerval, 0.5-2(-4) mm long, in longer sori the base ± concave. Indusium pale to brownish, delicate, subentire, with ± convex free edge, narrowed at the free sides, 0.3-0.5 mm wide, nearly always strongly intramarginal.
Epiphytic, often among mosses, on trees and tree-ferns, very rarely terrestrial, from c. 1500 up to 2750 m.
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