On the Anatomical Structures of the Lepidodendralean Stem “Lepidodendrontripunctatum from Coal Balls of Taiyuan Formation in Shandong Province, North China Diaphorodendron rhombicum sp. nov., a New Anatomically Preserved Lepidodendralean Stem from the Taiyuan Formation in Southern Shandong Province, North China A Study on Origin and Evolution of Cordaitaceae in Late Paleozoic CATHAYSIAN PALEOCONTINENT AND CATHAYSIAN FLORA The Cordaitean Fossil Plants from Cathaysian Area in China Anatomical Structure of Leaf Cushion of Lepidodendron lepidophloides Yao Anatomically-preserved Lepidodendralean Plants from Permian Coal Balls of China: Sigillariopsis Scott