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NZ Plants

Asplenium haurakiense - Hauraki Gulf spleenwort

Spleenwort family: Aspleniaceae

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