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Camptosorus rhizophyllus
http://www.hawriverprogram.org/NCPlants/Camptosorus_rhizophyllus_page.html
Image from North Carolina.
Walking Fern
http://members.aol.com/palmferndc/ferns/walking.html
Camptosorus rhizophyllus (L.) Link, one of the ferns of the District of Columbia (DC) area, synonym Asplenium rhizophyllum L.