1	"Indusium flattened, with 2 distinct lips; receptacle usually shorter than indusium"	Hymenophyllum
1	"Indusium tubular and somewhat urn- or trumpet-shaped; receptacle strongly exserted, bristle-like"	2
2	"Lamina regularly 2–3-pinnate; segments c. 1 mm wide with undivided vein; rhizome short and thick"	"Abrodictyum {Abrodictyum caudatum}"
2	"Lamina irregularly pinnate or lobed; segments 2–6 mm wide with veins branching several times; rhizome thread-like, creeping"	"Polyphlebium {Polyphlebium venosum}"