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"
Illustration Pilularia globulifera 0
Leaves of the Hawaiian species Marsilea villosa
The European species Pilularia globulifera bearing sporocarps
An African species of Marsilea with floating leaves
Regnellidium
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Regnellidium is a monotypic genus of ferns of family Marsileaceae.
Marsileaceae
…the other two genera by the presence of four leaflets on each leaf, although some species occasionally produce six leaflets per leaf. A second genus Regnellidium includes a single living species that grows only in southern Brazil and neighboring parts of Argentina; it has only two leaflets per leaf. The third…
Regnellidium diphyllum