This work was supported by the National Natural Science Foundation of China(Grant No.31970234);the Ministry of Natural Resources,China(Grant No.1211130000018001);Key-Lab for Evolution of Past Life and Environment in Northeast Asia,Ministry of Education,China(Grant No.2018JDEPw001).
A new species of the Osmundaceae,Plenasium xiei sp.nov.,is herein described from the Cretaceous of Northeast China.The specimens examined here represent the earliest unequivocal record of the extant genus Plenasium in...