LINDSAEA Group

1Fronds simply pinnate, veins free, pinnae numerous, spreading, jointed to rachis.
1'Fronds otherwise.
2Pinnae or lobes elongate, bearing many sori, each at the end of a single vein; lamina rather thick.
2'Pinnae or lobes, if elongate, bearing a sorus connecting the ends of several veins; lamina thinner.
3Fronds flnely divided, the ultimate divisions small and connected with each other by wings; sori solitary at apices of ultimate divisions
3'Fronds variously branched; leaflets distinct, each with several sori or a more or less continuous marginal sorus