The Case of the Missing Polyploidy

Osmunda regalis, a royal fern

Osmunda regalis, a royal fern.

For Wednesday 16 April Brian Thomas writes: “Fossil Plant Chromosomes Look Modern.”

An 180 million year-old royal fern fossil has been discovered in Sweden that is so stunningly preserved that it still shows the components of individual cells. The nucleus – and even the nucleolus – can be easily seen, and cells that appear to be in the process of division show their chromosomes. The paper, “Fossilized Nuclei and Chromosomes Reveal 180 Million Years of Genomic Stasis in Royal Ferns,” in Science, is unfortunately closed access, but phys.org has pictures. The preservation is good enough, in fact, that the researchers report that they’re basically the same as in living royal ferns. The “living fossil” creationist argument is probably well familiar to you, so the content of Thomas’ article shouldn’t be all that surprising. Continue reading