1 | Indusia glabrous; sporangia not setiferous. |
1' | Indusia with a few short hairs; sporangia setiferous or not. |
2 | Sterile pinnae thin, margin deeply serrate distally |
2' | Sterile pinnae rigid when dry, entire |
3 | Sporangia not setiferous |
3' | Sporangia setiferous. |
4 | Sporangia with several setae; basal pinnae not reduced. |
4' | Sporangia with 0-2 setae; reduced basal pinnae present on most specimens |