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NZ Plants

Arachniodes aristata

Family: Dryopteridaceae

Arachniodes aristata is a terrestrial fern with creeping stems (rhizomes), broad, glossy green, harshly textured fronds. The basal secondary leaflets are conspicuously enlarged to give the fronds a 5-angled outline.

Found on Raoul Island of the Kermadec Islands.

Vegetative characteristics

Fertile frond and sporangia

Plant form: creeping with fronds up 80 cm in length

Frond appearance: similar to sterile frond

Frond stalk, midrib: scales, hairs

Sporangium location: on lower frond surface

Frond shape:  broadly oval to 5-angled

Sporangium position: to either side of vein

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

Sporangia distribution: in groups (sori)

Frond surface: scarce small hairs; scales on midrib

Sorus shape: circular

Leaflets: attached along base, oblong, toothed, pointed at tip

Sorus covering:  kidney-shaped