supported by the Knowledge Innovation Project of the Chinese Academy of Science(KZCX2-YW-JC104,KZCX2-YW-155);the National Natural Science Foundation of China(40972001,30970186);State Key Laboratory of Palaeobiology and Stratigraphy(Y026150112,NIGPAS)
Phymatopteris Pic.Serm.,a derived polypodiaceous fern,is one of the many fern genera that still suffer from nomenclatural confusion.Its generic circumscription and phylogenetic relationships with other selligueoid fer...