| General Information |
| Distribution | Native to the American Tropics.In the Hawaiian Islands,
naturalized on
Kaua`i, O`ahu, Moloka`i, Lana`i, Maui, Hawai`i.
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| Habitat | Moist consolidated cinder, and basalt banks along trails and streams |
| Elevation | 0-4400 m
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Habit
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Terrestrial or epipetric, delicate, on moist, rocky banks; rhizomes short-creeping.
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Leaves
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Fronds erect-arching, close, 15-45 cm long; stipe dark reddish brown to black, shiny, glabrous except scaly at base; blade 2- to 4-pinnate, broadly to narrowly deltate; pinnae linear-deltate, fan-shaped if not again divided; ultimate segments fan-shaped with centrally attached stalk, membranous, outer margins rounded, toothed, often lobed or cleft; veins ending at sinuses between marginal teeth.
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Sori
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Sori often 1-2 per segment, U-shaped at bases of sinuses.
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Notes
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Name honors Giuseppe Raddi (1770-1829), an Italian botanist.
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Contributor
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Sally Eichhorn
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