KEY TO THE VARIETIES

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