Your search found 4 image(s) of armpits of Cinnamon and Interrupted Fern.
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Cinnamon Fern
Osmundastrum cinnamomeum
Look for it in bogs, peatlands, pocosins, wet savannas, floodplains, blackwater stream swamps & other wetlands
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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.
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Tufts of white to light brown hairs at base of pinna, per Peterson Field Guide to Ferns of Northeastern and Central North America.
Interrupted Fern
Claytosmunda claytoniana
Look for it in upland forests, woodlands, and balds, moist to rather dry
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Few or no hairs at base of pinna, per Peterson Field Guide to Ferns of Northeastern and Central North America.
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The collar at the base of the pinna is not fuzzy like Cinnamon Fern's is, per Ferns of the Smokies.