""'Marsilea " "'is a genus of approximately 65 species of aquatic ferns of the family Marsileaceae.
4.
It is a floating aquatic fern, with very fast growth, capable of spreading over lake surfaces to give complete coverage of the water in only a few months.
5.
With the equable climate during the early Eocene, warm temperatures in the arctic allowed for the growth of azolla, which is a floating aquatic fern, on the Arctic Ocean.
6.
The name literally means " early Salvinia ", and was given in the erroneous belief that the fossils were an earlier form of the living aquatic fern " Salvinia ".
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