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Like all ferns, the oblong woodsia reproduces by producing spores instead of seeds. These spores develop a small green disc called a prothallus, which in turn produces the gametes. The gametes have to swim through water to reach each other in order to fuse and produce a new spore-bearing plant. The thinnest of films will do, but this reliance on water means the fern is limited to a habitat that remains wet or moist for at least part of the year.


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Source: ARKive

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