| General Information |
| Distribution | Hawaiian Islands.In the Hawaiian Islands,
endemic to
Kaua`i. This species was formerly considered extinct (Palmer 2003), but was rediscovered on Kaua’i in 2003 (Aguraiuja and Wood, 2003). One population consisting of 62 reproductive individuals is known (Aguraiuja, unpublished)..
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| Elevation | 500-1000 m
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Habit
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Plants medium-sized. Rhizomes short-creeping to decumbent.
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Leaves
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Fronds erect, 10-75 x 5-20 cm. Stipes and rachises purplish black, shiny, scaly at base. Blades 3-pinnate to 3-pinnatifid or 4-pinnate, herbaceous, thinly chartaceous, lanceolate, finely dissected; rachises same color as stipes. Pinnae 15-35 pairs, lanceolate, up to 20 cm long. Ultimate pinnule segments narrow, linear, or linear-lanceolate, 0.4-1.4 mm wide. Veins free, usually one in each segment.
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Sori
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Sori marginal, usually less than 1 mm long, opening outward on wider segment tips. Indusia thin.
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Notes
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Presumably extinct. Asplenium dielmannnii was a remarkably beautiful, finely dissected terrestrial fem that has been placed in seven different genera. It apparently has not been seen in the wild since around 1900; in 1914 A. S. Knudsen, who had earlier collected it, said the fem had disappeared from the Halemanu Mountains.
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Contributor
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Sally Eichhorn
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