| 1 | Upper surface of costae of ultimate leaflets raised; fronds ± elliptical, mostly bipinnate. |
| 1' | Upper surface of costae of ultimate leaflets grooved, the groove decurrent into the groove of the supporting rachis; fronds deltoid in outline, 3-4-pinnate |
| 2 | Young parts of plant protected by scales and hairs |
| 2' | Young parts of plant protected by hairs only. |
| 3 | Outer indusium not distinct from rest of lamina. |
| 3' | Outer indusium quite distinct from lamina of leaflet |
| 4 | Pinna-rachis raised on upper surface; fertile pinnules deeply lobed |
| 4' | Pinna-rachis grooved on upper surface; fertile pinnules not lobed |
