BushDoctor
Certified GKH Gardening Expert
Certified GKH Gardening Expert
Answered on October 25, 2021
Those are spore-bearing structures. All ferns reproduce by spore, more like a mushroom, and these structures produce those spores.
https://www.gardeningknowhow.com/houseplants/ferns-houseplants/propagating-ferns.htm
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