sea fir

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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. Description Despite a superficial resemblance to plants, air ferns are actually animal skeletons or shells of marine hydroids of the class Hydrozoa, phylum Cnidaria.

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