White growths hanging from terrarium plumosa fern?

Question

We have what I believe to be a plumosa fern in a terrarium. We’ve had it several years now. A few months ago, we noticed these white cylindrical growths coming off it (see photo). Since then, they’ve multiplied. Any idea what these are? Are they dangerous to the plant?

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Answer 1

This is a sign of a healthy plant. These are what house the spores to spread these plants. Instead of pollen or seeds, ferns reproduce by spores.

This will not harm your plant in any way. Just let these mature as normal.