Definitions for azolla caroliniana
mosquito fern, floating fern, Carolina pond fern, Azolla caroliniana(noun)
small free-floating aquatic fern from the eastern United States to tropical America; naturalized in western and southern Europe
Azolla caroliniana is a species of Azolla native to the Americas, in eastern North America from southern Ontario southward, and from the east coast west to Wisconsin and Texas, and in the Caribbean, and in Central and South America from southeastern Mexico south to northern Argentina and Uruguay. It is a freshwater aquatic fern, with scale-like fronds 5–10 mm long, green to reddish, most often reddish in strong light and in winter. They are covered in fine hairs that give it the appearance of velvet. It is able to fix nitrogen from the air by means of symbiotic cyanobacteria. It can survive winter water temperatures of 5 °C, with optimum summer growth between 25-30 ºC.
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