Regnellidium
| Regnellidium | |
|---|---|
 |
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| Scientific classification | |
| Kingdom: | Plantae |
| Division: | Pteridophyta |
| Class: | Polypodiopsida / Pteridopsida (disputed) |
| Order: | Salviniales |
| Family: | Marsileaceae |
| Genus: |
Regnellidium Lindm. |
| Species | |
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Regnellidium diphyllum Lindm. |
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Regnellidium diphyllum Lindm.
†Regnellidium upatoiensis
Regnellidium is a monotypic genus of ferns of family Marsileaceae.
The single living species, Regnellidium diphyllum, the two-leaf water fern, is native to southeastern Brazil and adjacent regions of Argentina. It resembles its relatives from the genus Marsilea, but has 2-lobed leaves (rather than 4). This fern is sometimes grown in aquaria. It is the only non-flowering plant that produces latex.
A fossil assigned to the species Regnellidium upatoiensis has been found in Cretaceous deposits of the eastern United States.
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