The roots of " Marsilea " and " Regnellidium " are noteworthy for containing vessel elements.
2.
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.
3.
The single living species, " "'Regnellidium diphyllum " "', the two-leaf water fern, is native to southeastern Brazil and adjacent regions of Argentina.
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