It’s not much to look at, but Psilotum nudum‘s naked fronds* *hold a cautionary tale for biologists:

Psilotum looks a great deal like some of the earliest fossils of land plants. One of the earliest such fossils is Rhynia, the first specimens of which which were unearthed in Aberdeenshire around 1910, a mere 410 million years after they were originally buried.