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NZ Plants
Tmesipteris lanceolata - fork fern
Family: Psilotaceae
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Young stem with sterile and fertile leaves
L Jensen
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Mature stem with sterile and fertile leaves
I MacDonald
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Stem upper surface, with sterile leaves
L Jensen
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Stem, lower surface with sterile leaves
L Jensen
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Stem with sporangia on forked leaves
L Jensen
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Forked fertile leaf, side view
L Jensen
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Forked fertile leaf from above
L Jensen
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Forked fertile leaf from below
L Jensen
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Tmesipteris lanceolata is occasionally terrestrial but usually an epiphyte on tree fern trunks. It has a creeping stem (rhizome) that lacks roots, absorbing water instead with filamentous rhizoids. A pendulous and undivided aerial stem is formed that lacks true leaves, functioning instead with scale leaves. Scale leaves are flattened in one plane, are glossy green, broad, and stiff. Round-ended sporangia are fused in pairs and lie on the upper surface at the base of forked fertile leaves.
Found on the North Island south to the Bay of Plenty
Vegetative characteristics |
Fertile scale leaf and sporangia |
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Plant form: pendulous unbranched stem, up to 20 cm long |
Dstribution, appearance: mostly on the lower portion of stem; forked, same size as sterile leaves |
Scale leaf arrangement: in two rows |
Sporangium location: upper surface of fertile scale leaf |
Scale leaf shape: oval, tapering to a short spine-like tip |
Sporangium position: at base of fertile scale leaf |
Scale leaf size: up to 25 mm |
Sporangia distribution: in a fused pair (synangium) of equal size, 2-4 mm long |
Scale leaf surface: glossy green, leathery |
Sporangium shape: with round ends |