image: This is a detail of ground tissue in the pith of the fossilized fern rhizome showing cells with preserved nuclei and nucleoli. This image relates to a paper that appeared in the 21 March, 2014, issue of Science, published by AAAS. The paper, by Benjamin Bomfleur at the Swedish Museum of Natural History in Stockholm, Sweden, and colleagues was titled, "Fossilized Nuclei and Chromosomes Reveal 180 Million Years of Genomic Stasis in Royal Ferns." view more
Credit: [Image courtesy of Benjamin Bomfleur]