Asplenium rhizophyllum
The walking fern is a small evergreen spleenwort of eastern North America with undivided, long-tailed leaves whose tips root where they touch moss or rock, forming chains of new plants. It grows on shaded, moss-covered limestone and other alkaline rock in cool, humid ravines. It is fully hardy and needs a cold winter, lime in the medium and steady moisture.
Where it grows wild
Grows on shaded boulders, ledges and crevices of limestone or other alkaline rock, usually among moss, and rarely on sandstone, fallen logs or soil. Typical sites are shaded ravines, bluffs and outcrops in deciduous forest. Young plants hold their leaves flat against the rock; mature plants arch them.
Mostly a plant of the Appalachians, the Ozarks and the Great Lakes region at low to moderate altitudes. Few GBIF records carry an elevation; the measured sites are at about 70–300 m.
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Profiles are drafts built from measured range and climate and from published sources; each section carries its own confidence in the app. Photo from Wikimedia Commons, used under its CC BY-SA 3.0 licence, unmodified.