Ferns, Fern Allies, Polk County, North Carolina, Equisetaceae, horsetail, Lycopodiaceae, clubmoss, Selaginellaceae, spikemoss, Isoetaceae, quillwort, Ophioglossaceae, adder’s-tounge, Osmundaceae, flowering-fern, Hymenophyllaceae, filmy-fern, Polypodiaceae