duckweed fern

English

Noun

duckweed fern (plural duckweed ferns)

Any of various species of aquatic fern in the genus Azolla.
- 2018, Tim Flannery, Europe: A Natural History, page 76:
  If you have ever had a pond you will know Azolla, a.k.a. pondweed, duckweed fern or fairy moss.

References

duckweed fern on Wikipedia.Wikipedia
Azolla on Wikispecies.Wikispecies
Azolla on Wikimedia Commons.Wikimedia Commons

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