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Nephrolepis Schott

Terrestrial, subepiphytic or epihytic ferns of small to large size. Rhizome compact, +/- erect, ensely clothed in brown, non-clathrate, peltate-based, pale-edged, often hairy scales, radially symmetrick with close fronds, each associated with a slender, root-bearing, often proliferous runner, the caudex sclerotic, dictyostelic, the runner protostelic. Fronds long stipitate, the stipes not articulate the rot rhizome, fibro-vascular bundles 6 or more, arranged in a U-shape, the 2 adaxial bundles larger; the lamina long and narrow, pinnate, the pinnae sessile, articulate to the rachis, the apical pinnae gradually reduced, chartaceous to sub coriaceous, paleate, hairy, or glabrescent, costate, the costa adiaxially grooved, margin entire to slightly crenate or lobed, veins free, simple or more often 1 - 3-forked, one vein group in each crenation, each branch terminating in a conspicuous intra- or submarginal hydathode, often visible as a while scale on the adaxial surface. Sporangia arranged in sori terminal on the veins, submarginal or intramarginal, generally discrete, round and served by a single vein, or elongate along the margin and served by several veins, indusium extrorse, round-reinform attached at the sinus, or doundish and attached across a broad base, or elongate along the margin, pdeicel long, 3-seriate, annulus longitudina, interrupted, of 12 - 14 thickened cells. Spores monolete with an irregularly roughened surface, translucent.

Species in Papuasia

1a. Sori on separate marginal lobes 2
Sori marginal or intra-marginal, not on separate lobes 6
2a. Indusium with a broad base 3
Indusium with a narrow base 5
3a. Lamina lobes widened apically, the outer edge of the indusium reaching the margin, the sori thus protected by 2 lips N. rosenstockii
Lamina lobes not widened apically 4
4a. Indusia +/- free at the sides; pinnae more than 5 cm long N. dicksonioides
Indusia attached at the sides, opening by an apically angled slit on the apical margin of the lamina lobe; pinnae less than 5 cm long N. schlechteri
5a. Pinnae more than 5 cm long, lobed beyond the receptacle N. acuminata
Pinnae less than 2 cm long, the lobes not extending beyond the receptacle N. lauterbachii
6a. Pinae usually less than 2 cm long 7
Pinnae 5 cm or more long 9
7a. Scandent, stolons a major part of the plant, producing small plants at regular intervals; pinnae short and rounded N. radicans
Not scandent, stolons thinner and less dominant; pinnae +/- elongate and narrowed apically 8
8a. Usually epihytes; pinnae not conspicuously auricles nor imbricate, c. 3 mm wide N. lauterbachii
Terrestrial, roots often tuberous; pinnae conspicuously auricled, +/- imbricate, c. 5 mm wide N. cordifolia
9a. Sori medial; base of pinnae hardly auricles N. biserrata
Sori marginal; base of pinnae slightly to strongly auricled on the acroscopic margin 10
10a. Fronds usually long, +/- pendulous; pinnae strongly falcate, to c. 6 cm long, +/- glabrous

N. falcata

Fronds erect; pinnae slightly falcate, to 8 cm long, covered with small, hair-like scales, especially when young N. hirsutula

*** N. exaltata ****