Sadleria unisora is a species of chain fern endemic to the Alakaʻi plateau on the island of Kauaʻi.
Sadleria unisora is only found at elevations between 400–1,520 m (1,310–4,990 ft) in native wet forests on the island of Kaua'i, where it occupies steep walls above streams and canyons.
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