Medium size, high-climbing epiphytes. Rhizome vertically long-creeping, stout, little-branched, bearing roots ventrally and fronds in 3 - 6 dorsal rows, dictyostelic with a large +/- channelled ventral strand producing root traces, and 2 or more dorsal wedge-shaped strands, large overlapping leaf gaps with leaf traces of several to many strands arranged in a ring; scales on young parts broad, flat, thin, concolorous, peltate or perfoliate, the magins +/- fringed with hairs. Stipes long, +/- terete, with 2 continuous aerophores, the stipe and aerophores both gradually decurrent into the ridges of the rhizome, the vascular bundles in a simple open ring, the 2 adaxial bundles larger; lamina simple pinnate, the lateral pinnae articulate to the rachis, terminal pinna not so, the pinnae +/- equal, lanceolate, coariaceous chartaceous, glabrescent, margins entire; the veins free, simple or forked, parallel and terminating in the cartilaginous margin, no main veins; fertile pinnae contracted, sometimes strongly so, linear to linear-oblong; juvenile fronds simple, later fronds developing more pairs of pinnae. Sporangia acrostichoid, completely covering lower surface of fertile pinnae, exindusiate, paraphyses lacking, annulus longitudinal, interrupted, of 14 - 22 thickened cells. Spores monolete, brownish, with a copious folded perispore.
Species in Papuasia
|1a.||Sterile pinnae very coriaceous, drying brownish; fertile pinnae 10 - 20 mm wide; spores 90 - 110 um long excluding the perispore||L. intermedia|
|Sterile pinnae not very coriaceous, drying dark olive-green; fertile pinnae rarely to 10 mm wide, spores 45 - 65 um long excluding the perispore.||2|
|2a.||Upper surface of fertile pinnae less than 2 mm wide; wing of spore narrow, lacking reticulate thickening||L. kingii|
|Upper surface of fertile pinnae 3 - 6 ( - 10) mm wide; spores with an ample folded perispore||L. lineata|