supported by the Knowledge Innovation Program of the Chinese Academy of Sciences,(KZCX2-YW-154);the National Basic Research Program of China(2006CB701400)
A well-preserved permineralized osmundaceous fern was discovered from the Middle Jurassic Tiaojishan Formation of Beipiao,Liaoning Province,China.The rhizome is about 50 cm high and 35-41 cm in diameter and can be att...