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is also called Su Tie. The oldest and most primitive naked plant that was extinct in ancient times. First appeared in the upper mud basin formation, the most prosperous period in the charcoal period, to the end of the third era extinction. The shape of the leaves is very much like ferns and ferns, with a large shape of 2
to
3
back feather-like compound leaves, and into a binary split, by the adenocartic cortical, two mask pores, epidermis degree is very high, stems and eradication with real ferns outside the tube, but also has the formation layer of the fern plant and secondary wood, secondary cortical cortical part. Plants come in a variety of forms, tree-like, shrub-like, or climbing-like. Most scholars believe that the development of ferns into seed ferns, from seed ferns further evolved into two, one with large plume-shaped compound leaves of the Benesu iron and sorite, the other evolved into a harsh Dee, Ginkgo, pine cypress and buy hemp rattan. The bee plant has the potential to originate from a group of the most primitive seed ferns.
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