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NZ Plants
Arachniodes aristata
Family: Dryopteridaceae
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Frond
I MacDonald
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Frond stalk (stipe) with scales
L Jensen
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Lower portion of stipe, scale detail
L Jensen
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Frond upper surface, midrib (rachis) with leaflets
I MacDonald
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Frond upper surface, rachis with scales
L Jensen
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Rachis, glandular hairs
L Jensen
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Fertile leaflet, upper surface
L Jensen
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Young fertile leaflet, lower surface with sori
L Jensen
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Young sori, expanded indusium covering developing sporangia
L Jensen
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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 |
