walking fern

American Heritage® Dictionary of the English Language, Fourth Edition

1. n. An eastern North American fern (Camptosorus rhizophyllus) having undivided fronds that often take root at the tip.

Century Dictionary and Cyclopedia

1. n. A small tufted evergreen fern, Camptosorus rhizophyllus, native of eastern North America, having the fronds heart-shaped or hastate at the base, and tapering above into a slender prolongation, which frequently takes root at the apex (whence the name;). Also walking-leaf.

Wiktionary

1. n. Either of two species of fern in the genus Asplenium (Asplenium rhizophyllum or Asplenium sibiricum) that produces new plantlets from the tips of its leaves.

GNU Webster's 1913

1. (Bot.) See Walking leaf, below.

WordNet 3.0

1. n. ferns having lanceolate fronds that root at the tip