Your search found 2 image(s) of pinnae of Cinnamon and Interrupted Fern.
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Cinnamon Fern,
Osmundastrum cinnamomeum
Leaflets deeply lobed (pinnate-pinnatifid); lobes rounded &slightly pointed, per Ferns of the Smokies.
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Interrupted Fern,
Osmunda claytoniana var. claytoniana
Lobes of vegetative leaflets rounded (vs. slightly pointed in cinnamon fern, per Ferns of the Smokies.