If you are actually inquiring about a plant
that partially fits this description (and not
dyed, preserved hydrozoans which are often
marketed as "air ferns"), you have probably
encountered a member of the genus
Tillandsia which belongs to the pineapple
plant family, Bromeliaceae. Most Tillandsia
species are epiphytic, using their root systems
for anchoring to trees or rocks, while absorbing
nutrients and moisture through their leaves.
While this lifestyle works perfectly fine in their
natural habitats, you will probably be
unsuccessful in maintaining these species (also
erroneously known as "air plants" or "air ferns")
over the long-term without supplemental water or
fertilization. If you are interested in
maintaining members of this diverse and attractive
plant genus in your home, basic husbandry
information can be found online. Just look under
something like "Tillandsia care".
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