Marsilea drummondii is a species of fern known by the common name nardoo. There is some evidence that the nardoo contributed to their deaths. The Indigenous Australians once made a porridge of pulverized "Marsilea" sporocarps called "nardoo". During floods in the Gwydir River basin 2,200 sheep died after eating nardoo. Ivy Nardoo of Boulia, Ted Marshall and Linda Craigie of Mount Isa. Nardoo must be prepared properly using heat before consumption to destroy the thiaminase.