Metathelypteris (H.Ito) Ching
Terrestrial ferns of small to moderate size. Rhizome erect, ascending or prostate with closely spaced fronds, radially symmetric, dictyostelic, bearing thin, narrow scales, the scales naked or with a few short acicular unicellar hairs on the surface. Fronds long stipitate, the stipes with 2 vascular bundles at the base uniting upwards to form a single U-shaped vascular strand, hairy or naked, grooved above, the groove continuous with the rachis, not opening to admit axes of pinnae, lamina pinnate with deeply pinnately lobed pinnae, rarely bipinnate with adnate pinnules, the pinnae and lobes +/- opposite, costae prominent and not grooved above, basal pinnae not or little-reduced, lobes or pinnules entire to serrate, sometimes with acicular hairs, surfaces with minute acicular and/or capitate hairs, or naked, axes sometimes with hair-pointed scales, usually with transitions to long slender septate hairs; veins free, pinnate in lobes or pinnules, veinlets simple or branched, terminating in a thickened tip not reaching the margin. Sori round, with a thin, reinform indusium naked or sometimes hairy, not terminal on the veins; sproangiaon a 2-seriate stalk, naked or sometimes with a hair on the stalk, the anulus longitudinal, interrupted, of 13-18 thickened cells, Spores monolete, dark, with thick rings or raised bands or irregular ridges variously united.
Key modified ex Holttum 1981, F1. Males. ser. 2, 1:351
Species in Papuasia
|1a.||Veins always simple, except sometimes in basal acroscopic lobes of pinnae||M. gracilescens|
|Veins normally forked, except distal ones||M. dayi|