Osmundaceae

1. Fertile portion on a separate leaf, lacking green pinnae; bases of vegetative pinnae with conspicuous tufts of cinnamon colored hair.

Osmundastrum

1. Fertile portions terminal on the leaf or occurring in the middle zone of the leaf, with vegetative pinnae both above and below; bases of vegetative pinnae glabrous or inconspicuously hairy at most.

Osmunda

 

All species found in Osmundaceae

Osmunda claytonianaINTERRUPTED FERN 
Osmunda regalisROYAL FERN 
Osmundastrum cinnamomeumCINNAMON FERN 

Citation:

MICHIGAN FLORA ONLINE. A. A. Reznicek, E. G. Voss, & B. S. Walters. February 2011. University of Michigan. Web. December 13, 2018. https://michiganflora.net/family.aspx?id=Osmundaceae.