Asplenium dielfalcatum
An endangered spleenwort found only on O'ahu, Hawai'i, where it was long known as Diellia falcata. It forms loose clumps of narrow, leathery fronds with sickle-shaped pinnae on shaded, often north-facing slopes and gulches in the native forests of the Wai'anae Mountains and parts of the Ko'olau. Herbarium labels place it mainly in mesic forest at about 500–850 m, so it isn't a cloud-forest plant.
Where it grows wild
It grows on the ground and among rocks on steep shaded slopes, gulch sides and rock crevices. Herbarium labels describe north-facing slopes in degraded native forest with Pouteria, Sapindus oahuensis, Diospyros, Pipturus and Urera kaalae, typical mixed mesic forest of the Wai'anae Mountains. It sometimes forms dense patches, and one collector found a colony covering half a hectare.
Recorded elevations are about 490–840 m, mostly 600–760 m. Published accounts give about 400–1,000 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.