Azolla
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Azolla is a genus of seven species of aquatic ferns in the family Salviniaceae. They are extremely reduced in form and specialized, having a significantly different appearance to other ferns and more
Azolla covering the Canning River (Western Australia)
Transmission electron micrograph of a megaspore of the genus Azolla from postglacial sediments of Laguna El Junco, Galápagos Island of San Cristobal
Azolla filiculoides root cross section
Marsileaceae
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Marsileaceae is a small family of heterosporous aquatic and semi-aquatic ferns, though at first sight they do not physically resemble other ferns. The group is commonly known as the "pillwort family"
Leaves of the Hawaiian species Marsilea villosa
The European species Pilularia globulifera bearing sporocarps
An African species of Marsilea with floating leaves