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NZ Plants
Blechnum fluviatile - kiwakiwa, creek fern
Hard fern family: Blechnaceae
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Plant
L Jensen
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Fertile frond (left) and sterile frond (right)
I MacDonald
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Sterile frond upper surface, midrib (rachis) and leaflets
L Jensen
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Sterile frond upper surface, rachis with scales
L Jensen
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Sterile frond lower surface, rachis with scales
L Jensen
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Rachis lower surface, scales and short hairs
L Jensen
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Rachis, detail of hairs
L Jensen
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Rachis, glandular hairs
L Jensen
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Leaflet, lower surface
L Jensen
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Leaflet lower surface, midrib with glandular hairs
L Jensen
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Fertile frond upper surface, rachis with leaflets
L Jensen
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Fertile frond lower surface, rachis and leaflets with sori
L Jensen
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Blechnum fluviatile has a stout, erect stem with a drooping circle of sterile fronds surrounding a few erect fertile fronds equal to slightly longer in length than the sterile fronds.
Found in damp coastal and lowland forest throughout New Zealand.
Vegetative characteristics |
Fertile frond and sporangia |
|---|---|
Plant form: arching to horizontal fronds up to 750 mm in length. |
Frond appearance: erect, leaflets very narrow and almost parallel to the frond axis (rachis) |
Frond stalk, midrib: scales abundant throughout |
Sporangium location: on lower frond surface |
Frond shape: linear |
Sporangium position: leaflet margin |
Frond blade: pinnate (divided 1 x into leaflets or pinnae) |
Sporangium distribution: in groups (sori) |
Frond surface: leathery |
Sorus shape: in a continuous line either side of midrib |
Leaflets: elliptic-oblong, rounded tip, margin toothed or smooth, attached by stalk or along base of leaflet |
Sorus covering: linear covering (indusium) opening toward midrib |
