You'll recall that Linda and I 'sort of' collect prehistoric plant species - both living and also fossil examples. We have Cycads, Gingkos, Horsetails, Tree Ferns, Wollemis and so on. It's very easy, however, to overlook the most ancient of all: the Liverworts that grow under our patio table!
These curious little plants don't produce seeds: instead, like mosses, they reproduce by means of spores. They are similar enough in anatomical details to be grouped with mosses as bryophytes, evolving from freshwater algae around 450 million years ago. This makes them among the most ancient land plants!
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