1	"Lamina with a black margin"	"Hymenophyllum marginatum"
1	"Lamina without a black margin"	2
2	"Margins serrate"	3
2	"Margins entire"	4
3	"Lamina 2–3-pinnate; primary pinnae divided on both sides; indusium obovoid with lips bluntly dentate; primary pinnae with only one sorus"	"Hymenophyllum cupressiforme"
3	"Lamina 2-pinnate; primary pinnae divided only on side towards frond tip; indusium narrowly elliptic with lips entire; primary pinnae with 1–4 sori close together"	"Hymenophyllum peltatum"
4	"Frond erect; stipe with prominent wing extending almost to base; lamina dark green 2–3-pinnate; sori often paired, usually not immersed in lamina"	"Hymenophyllum australe"
4	"Frond usually pendent; stipe without prominent wing (sometimes with slight wing at top of stipe); lamina pale green, 1–3-pinnate; sori borne singly, partly immersed in lamina"	5
5	"Stipe with tuft of straw-coloured hairs at base; lamina 2–3-pinnate; pinnae rhomboidal to fan-shaped; sori usually slightly wider than segment"	"Hymenophyllum flabellatum"
5	"Stipe with at most a few hairs at base; lamina 1–2-pinnate; pinnae with few linear segments; sori narrower than segment"	"Hymenophyllum rarum"