Woodwardia

1. Sterile leaves pinnate, with pinnae deeply lobed, mostly 13–25 per side; sterile and fertile leaves similar.

W. virginica

1. Sterile leaves merely deeply lobed (the lobes connected at the axis by a narrow wing of tissue), the lobes entire to somewhat undulate, mostly 6–14 per side; sterile and fertile leaves strongly dissimilar, the sterile with very narrow linear pinnae.

W. areolata

All species found in Woodwardia

Woodwardia areolataNETTED CHAIN-FERN 
Woodwardia virginicaVIRGINIA CHAIN-FERN 

Citation:

MICHIGAN FLORA ONLINE. A. A. Reznicek, E. G. Voss, & B. S. Walters. February 2011. University of Michigan. Web. October 18, 2017. http://michiganflora.net/genus.aspx?id=Woodwardia.