1	"Veins anastomosing"	"Lygodium reticulatum"
1	"Veins free"	2
2	"Stalks of pinnules of similar length along pinnae; pinnules articulated at base, deciduous"	"Lygodium microphyllum"
2	"Stalks of pinnules decreasing in length towards pinna apex; pinnules non-articulated at base, persistent"	3
3	"Fronds 2-pinnate"	"Lygodium flexuosum"
3	"Fronds 3-pinnate"	"Lygodium japonicum"