A triploid hybrid between walking fern and Tutwiler's spleenwort was accidentally produced in culture. The name "walking fern" was derived from the way the fern spreads. Much more rarely, walking fern hybridizes with two other common spleenworts of eastern North America. Asplenium rhizophyllum, the (American) walking fern, is a frequently-occurring fern native to North America. The park is also home to ferns including maidenhair, interrupted and the unusual walking fern. Among interesting plants in the area are the walking fern and Jeffersonian twin-leaf. Walking fern grows on shaded boulders, ledges and in crevices, usually covered with moss.