A flowerless green plant of the division Pteridophyte, which comprises the ferns and their relatives.
- H. Potonié first hypothesized the existence of a group of such transitional plants between pteridophytes and seed plants in 1899, but it is now known that ferns themselves are not the direct ancestors of seed plants.
- The term ‘xerophytic fern’ is somewhat of an oxymoron as most pteridophytes inhabit moist environments.
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