DIRK WIERSMA / SCIENCE PHOTO LIBRARY DIRK WIERSMA / SCIENCE PHOTO LIBRARY
Pecopteris is a now extinct genus of ferns that lived from the late Devonian and thrived in the Carboniferous period. They were flowerless and seedless vascular plants having true roots from a rhizome and fronds that uncurl upward. Closely arranged leaflets standing out perpendicularly on the vein, thus resembling a comb, characterize Pecopteris.
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