Asplenium pinnatifidum
A small evergreen rock fern of eastern North America with lobed, tapering fronds. It is a fertile tetraploid thought to derive from a hybrid of walking fern and mountain spleenwort. It lives in crevices of acidic rock, especially sandstone, on steep, shaded faces in the Appalachians, Ozarks and nearby uplands. Grow it cool, in a lean acidic gritty mix in a crevice-like spot, with moderate light and a real winter.
Where it grows wild
It grows in crevices and on ledges of acidic rock, mainly sandstone, on steep cliffs and boulders, usually in wooded, shaded settings. The roots sit in a thin film of acidic grit and humus in the cracks, which drains instantly but stays damp.
Literature gives sea level to about 1,000 m. The few wild records with an elevation run from 109 to 528 m, with a median of 360 m, on low to mid-elevation uplands.
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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.