Bryophytes are the oldest terrestrial green spore-forming plants, although no strong scientific evidence for this has been appeared in the literature. This hypothesis was mainly based on the resemblance of the present-day liverworts the first land plant fossils, the spores of which date back almost 400 million years. They are taxonomically placed between the algae and the pteridophytes and there are 14000 species of Bryophyta, 6000 of Marchantiophyta (=liverworts) and 300 of Anthoceratophyta, species.
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