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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. ==References== * *Mabberley, D. J. (1997). ''The Plant-Book''. Cambridge University Press. category:Monotypic plant genera 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Regnellidium」の詳細全文を読む スポンサード リンク
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