A fern.
Greek pteris, pterid‑, fern.
A pteridophyte (Greek phuton, plant) is a member of the Pteridophyta, a division of flowerless green plants that comprises the ferns and their relatives; pteridology is the study of ferns and related plants; and a pteridosperm is a fossil plant which is intermediate between the ferns and seed-bearing plants, dying out in the Triassic period.
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