Azollaceae is a family of aquatic plants which are commonly known as mosquito ferns. These ferns have tiny leaves that float on the surface of the water and form dense mats. Interestingly, there are several synonyms for Azollaceae, including the water fern family, Azolla family, and mosquito fern family. Additionally, some people refer to these plants as duckweed ferns or duckweed moss due to their size and appearance. Overall, regardless of what one calls these plants, they are an important part of both aquatic ecosystems and agriculture, as some species of Azollaceae have the ability to fix nitrogen from the air and fertilize rice paddies.