1	"Indusium round-reniform, +- centrally attached at a sinus"	Dryopteris
1	"Indusium peltate, centrally attached, without a sinus"	2
2	"Veins regularly netted; leaf 1-pinnate, teeth 0 or < 10 mm, without bristle-like tips"	"Cyrtomium {Cyrtomium falcatum}"
2	"Veins generally free, rarely +- joined; leaf 1--3-pinnate, teeth, generally including bristle-like tips, < 4 mm"	Polystichum