Archeopteris
Link between ferns and gymnosperms.

Archaeopteris is a member of a group of free-sporing woody plants called the progymnosperms and is an extinct genus of tree-like plants with fern-like leaves.Gymnosperms include such plants as conifers (pines, firs, cedars, redwoods). cycads, and Ginkgos. Archaeopteris, a link between ferns and gymnosperms, is a tree found in strata dating from the Upper Devonian to Lower Carboniferous (383 to 323 million years ago), and had a global distribution.

(See http://www.britannica.com/plant/Archaeopteris)

 

 

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