| 1 | Rhizome slender, wide-creeping; some sori elongate |
| 1' | Rhizome erect, or if creeping thick with fronds near together; sori not elongate. |
| 2 | Pinnae to c. 6 cm long, nearly all adnate to rachis, lobed not more than 4 to costa |
| 2' | Pinnae much longer, mostly not adnate to rachis and with adnate pinnules. |
| 3 | Basal basiscopic pinnules conspicuously longer than next. |
| 3' | Basal basiscopic pinnules not conspicuously longer than next. |
| 4 | Copious short capitate hairs present on lower surface of pinna-rachis and costae of pinnules |
| 4' | All hairs on lower surfaces acicular |
| 5 | Pinnules on largest pinnae almost free, lobed almost to costa. |
| 5' | Pinnules on largest pinnae all broadly adnate to pinna-rachis, lobed not more than half-way to costa |
| 6 | Lower surface of costae hairy; lobes of largest pinnules lobed almost to costule |
| 6' | Lower surface of costae glabrous; lobes of largest pinnules almost entire. |
