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NZ Plants

Asplenium chathamense - Chatham Island spleenwort

Spleenwort family: Aspleniaceae

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Vegetative characteristics

Fertile frond and sporangia

Plant form: short, erect rhizome with fronds up to 60 cm

Frond appearance: similar to sterile frond

Frond stalk, midrib: scattered slender, tapering scales

Sporangium location: on lower frond surface

Frond shape: elliptic to ovate

Sporangium position: close to leaflet margin

Frond blade: 2-3-pinnate (divided up to 3x into leaflets or pinnae)

Sporangia distribution: in groups (sori)

Frond surface: glossy, leathery

Sorus shape: linear

Leaflets: ultimate leaflets linear and undivided; basal leaflets divided into 2-4 segments

Sorus covering: linear covering (indusium)  opening toward midrib