Regnellidium
Regnellidium is a monotypic genus of ferns of family Marsileaceae.
| Regnellidium | |
|---|---|
 | |
Scientific classification  | |
| Kingdom: | Plantae |
| Clade: | Tracheophytes |
| Class: | Polypodiopsida |
| Order: | Salviniales |
| Family: | Marsileaceae |
| Genus: | Regnellidium Lindm. |
| Species | |
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Regnellidium diphyllum Lindm. | |
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.
A fossil assigned to the species Regnellidium upatoiensis has been found in Cretaceous deposits of the eastern United States.
References
- Lupia, R.; Schneider, H.; Moeser, G. M.; Pryer, K. M.; Crane, P. R. (2000). "Marsileaceae Sporocarps and Spores from the Late Cretaceous of Georgia, U.S.A". International Journal of Plant Sciences. 161 (6): 975–988. doi:10.1086/317567. S2CID 16981770.
- Mabberley, D. J. (1997). The Plant-Book. Cambridge University Press.
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