An article in The Guardian by palaeobotanist Susie Lydon covering a new study on the history of UV radiation on Earth.
A mixture of pollen viewed under a scanning electron microscope (and artificially coloured!). Photograph: By Dartmouth Electron Microscope Facility, Dartmouth College [Public domain], via Wikimedia Commons
A spore tetrad (green) and trilete spores (blue, ~30-35μm diameter) from a late Silurian sporangium (Burgsvik beds, Sweden). Spore genus is Scylaspora. Photograph: By Smith609 (Own work) [CC BY-SA 3.0 (http://creativecommons.org/licenses/by-sa/3.0)%5D, via Wikimedia Commons