| Air fern | |
|---|---|
| |
| A "potted" air fern | |
| |
Scientific classification 
| |
| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Cnidaria |
| Class: | Hydrozoa |
| Order: | Leptothecata |
| Family: | Sertulariidae |
| Genus: | Sertularia |
| Species: | S. argentea
|
| Binomial name | |
| Sertularia argentea | |
| Synonyms | |
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The air fern (Sertularia argentea) is a dead and dried colony of hydrozoans, a species of marine animal in the family Sertulariidae related to corals and jellyfish.
Air ferns are typically dyed green and sold as a curiosity, as a decorative "indoor plant"; the same skeletons of former colonies of hydroids are sold in their natural dried state as the sea fir and Neptune plant as underwater decorations for aquariums.