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NZ Plants
Asplenium haurakiense - Hauraki Gulf spleenwort
Spleenwort family: Aspleniaceae
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Frond
I MacDonald
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Frond upper surface, midrib (rachis) with leaflets
L Jensen
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Frond upper surface, rachis with leaflets
L Jensen
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Frond lower surface, rachis with scales
L Jensen
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Rachis lower surface with scales
L Jensen
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Fertile frond lower surface, leaflets with sori
L Jensen
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Fertile leaflets, sori with mature sporangia
L Jensen
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Asplenium haurakiense is a terrestrial fern with a short erect stem bearing glossy-green, thick leathery and erect fronds.
An endemic species found on the Three Kings Islands, Whale Island and coastal areas of the upper half of the North Island .
Formerly Asplenium flaccidum subsp. haurakiense.
Vegetative characteristics |
Fertile frond and sporangia |
|---|---|
Plant form: short, erect rhizome with 100-300 mm fronds (occasionally greater) |
Frond appearance: Similar to sterile frond |
Frond stalk, midrib: oval scales with thick-walled cells |
Sporangium location: on lower frond surface |
Frond shape: oblong to elliptic |
Sporangium position: close to leaflet margin |
Frond blade: 1-2-pinnate (divided 1-2x into leaflets or pinnae) |
Sporangia distribution: in groups (sori) |
Frond surface: leathery |
Sorus shape: linear |
Leaflets: variable, oblong to linear and from blunt to sharp tipped |
Sorus covering: 2-7 mm long, linear covering (indusium) opening toward midrib |
