| 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. Plants called A. ‘Edwinii’ have been considered to possibly represent a cultivar of A. raddianum or less likely A. concinnum. They can be recognized by U-shapred sori, fronds up to 100 cm long and 60 cm wide, and pinnules closest to the rachis overlapping the rachis on the side toward the frond tip (Palmer 2003). These ferns are established on West Maui and Lana`i. Their status and origin should be investigated..
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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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