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NZ Plants
Blechnum filiforme - thread fern, climbing hard fern
Hard fern family: Blechnaceae
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Mature, climbing plant
L Jensen
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Fertile frond (left), sterile frond (middle) and juvenile frond (right)
I MacDonald
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Juvenile plant, climbing stem (rhizome) with fronds
L Jensen
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Juvenile frond stalk (stipe) with scales
L Jensen
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Juvenile frond, midrib (rachis) with leaflets
L Jensen
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Frond intermediate between juvenile and mature
L Jensen
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Juvenile frond, rachis with hairs
L Jensen
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Mature sterile frond, upper surface of rachis and leaflets
L Jensen
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Mature sterile frond upper surface, rachis with bases of leaflets
L Jensen
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Mature sterile frond lower surface, rachis with hairs
L Jensen
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Rachis lower surface, scales and hairs
L Jensen
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Mature sterile frond, leaflet upper surface
L Jensen
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Mature sterile frond, leaflet lower surface
L Jensen
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Fertile frond, upper surface
I MacDonald
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Fertile frond upper surface, rachis and leaflets
L Jensen
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Fertile frond lower surface, rachis and leaflets
L Jensen
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Fertile leaflet, indusium with exposed sporangia
L Jensen
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Blechnum filiforme is a climbing fern with a distinct creeping juvenile stage. Adults are high-climbers with large, broad sterile and fertile fronds. The leaflets on the fertile fronds are long and thread-like..
An endemic fern of coastal and lowland forest found from the North Island to the north coast of the South Island.
Vegetative characteristics |
Fertile frond and sporangia |
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Plant form: Creeping, climbing rhizome with fronds up to 700 mm long |
Frond appearance: similar size to sterile fronds but with long and very narrow (thread-like) leaflets |
Frond stalk, midrib: scales present |
Sporangium location: on lower frond surface |
Frond shape: narrowly ovate-elliptic |
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: narrowly triangular-ovate, pointed; attached by a basal stalk |
Sorus covering: linear covering (indusium) opening toward midrib |
Juvenile: 50-250 x 10-50 mm linear fronds with elliptic-oblong , toothed and rounded leaflets |
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