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In page Medusagyne:

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The jellyfish tree presents a conundrum in that the seeds seem unable to germinate in the wild; no young plants have been observed in the natural stands.[1] Successful cultivation in botanic gardens has occurred in very humid conditions, but high humidity is unlikely in the exposed habitat where these trees are found in the wild.[1] It has been suggested that jellyfish trees have been lost from the more appropriate habitat of moist forests through competition with other species and climate change.[1]