The Occurence of Xenoxylon ellipticum in the Late Triassic from North Guangdong, China Middle Triassic Palynological assemblage in the Wangjiashan Basin of Jingyuan, Gansu and Its Stratigraphical Significance Morphologied Studies of Ctenozamites Drep A-Noides Chen ET Duan Sp. Nov Some Pteridosperms from Western Hubei in Late Triassic and Their Evolutionary Tendency The Micropaleoflora Features from Middle Carbonate Rock Formation of Jiezha Group in South Qinghai Petroleum Sporo-pollen Assemblages and Petroleum Source Rocks of North Tarim Upheaval in Xinjiang Study on a Species of Thinnfeldia from Liuzhi of Guizhou Province, with Remarks on Thinnfeldia Ettingshausen in China Studies on Annalepis from Middle Triassic Along the Yangtze River and Its Bearing on the Origin of Iso?tes Plants of Leptostrobus Heer (Czekanowskiales) from the Early Cretaceous and Late Triassic of China, with Discussion of the Genus A new species of Leptocycas (Zamiaceae) from the Upper Triassic sediments of Liaoning Province, China ON THE DISCOVERY OF CYCADOCARPIDlUM AND PODOZAMITES IN SAME SPECIMEN Studies on the Epidermal Structure of Two Species of Rhaphidopteris Morphological Studies of Rhaphidopteris hsüi sp. nov Morphological Studies on Pterophyllum guizhouense sp. nov. and P. astartense Harris from the Late Triassic of Guizhou, China