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Polypodium appalachianum
Tiny fern growing on rock outcropping, only specimen I saw of this species all day, but the snow cover was not helping.
Appalachian Mountains
Thank you drP, I am well aware of the difficulty, even when they are right in front of me. :)
Ferns can be awfully tricky to identify from a photo or two, but this one is easy. The overall shape is that of a rockcap fern, and the only species that grows in the Smokies is Polypodium appalachianum.