| 1 | Rachises and lower surface of axes of frond lacking scales |
| 1' | Rachis, pinna-rachises and axes of pinnules scaly on lower surface. |
| 2 | Scales on main rachis sparse; scales on pinna-rachis copiously ciliate. |
| 2' | Scales on main rachis abundant, with strongly thickened bases; scales on pinna-rachis not or little ciliate. |
| 3 | Basal scales thin; scales on rest of stipe and rachis flat above the terete base. |
| 3' | Basal scales rigid with inflexed edges; scales on rest of stipe and rachis almost wholly terete |
