Your search found 4 image(s) of armpits of Cinnamon and Interrupted Fern.
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Habitat: Bogs, peatlands, pocosins, wet savannas, floodplains, blackwater stream swamps, marshes, and other wetlands, less typically in merely mesic or even dry-mesic forests, especially if seasonally sub-irrigated
Only Cinnamon Fern has tan tufts of wool at pinnae bases ("hairy armpits"), per Peterson Field Guide to Ferns of Northeastern and Central North America.
Tufts of white to light brown hairs at base of pinna, per Peterson Field Guide to Ferns of Northeastern and Central North America.
Habitat: Upland forests, woodlands, and balds, moist to rather dry
Few or no hairs at base of pinna, per Peterson Field Guide to Ferns of Northeastern and Central North America.
The collar at the base of the pinna is not fuzzy like Cinnamon Fern's is, per Ferns of the Smokies (Evans, 2005).