Which pteridophyte is called a "living fossil"?

Q. Which pteridophyte is called a "living fossil"?
Answer: Equisetum
Notes: Equisetum, or horsetail, is termed a "living fossil" due to its resemblance to ancient giant fossils like Calamites from the Paleozoic era. It is the only surviving genus in its family Equisetaceae and displays features observed in prehistoric pteridophytes.

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