Regnellidium Explained

Regnellidium is a monotypic genus of ferns of family Marsileaceae.^[1]

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.^[2]

The genus name of Regnellidium is in honour of Anders Fredrik Regnell (1807–1884), a Swedish physician and botanist.^[3] It was first described and published in Ark. Bot. Vol.3 (Issue 6) on page 2 in 1904.^[1]

Other sources

• Mabberley, D. J. (1997). The Plant-Book. Cambridge University Press.

Notes and References

1. Web site: Regnellidium Lindm. Plants of the World Online Kew Science . Plants of the World Online . 3 November 2021 . en.
2. 10.1086/317567 . 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 . 16981770 .
3. Book: Burkhardt, Lotte . Verzeichnis eponymischer Pflanzennamen – Erweiterte Edition . Index of Eponymic Plant Names – Extended Edition . Botanic Garden and Botanical Museum, Freie Universität Berlin . 2018 . 978-3-946292-26-5 . pdf . German . Berlin . 10.3372/epolist2018 . 1 January 2021.