1 | One soral patch on each foliage frond, situated on a separate, stalked lobe, rhizome scales with a wide flabelloid margin |
1' | Soral patches 2-many on each foliage frond, situated on the lamina of the frond, rhizome scales without wide, flabelloid margin |
2 | Foliage fronds long, pendulous, fertile lobe reniform, base fronds with upper part deeply lobed, veins immersed |
2' | Foliage fronds erect, fertile lobe obovate or elliptical, rarely lobed, base fronds with upper part entire or sinuose, veins prominent |
3 | Soral patches many on each foliage frond, situated on the ultimate lobes |
3' | Soral patches 2 on each foliage frond, situated in the sinuses near the base of the frond, ultimate lobes sterile |
4 | Upper part of base fronds entire, foliage fronds erect. |
4' | Upper part of base fronds lobed, foliage fronds pendulous. |
5 | Foliage frond symmetrical, with two equal main lobes |
5' | Foliage fronds asymmetrical, with two unequal main lobes |
6 | Both soral patches with well-developed, forked, lateral sterile lobes. |
6' | Lateral soral patch with very short, simple, lateral sterile lobes. |