An osmundaceous rhizome with sterile and fertile fronds and in situ spores from the Jurassic of western Liaoning  

作　　者：YANG XiaoJu ZHANG Wu ZHENG ShaoLin 

机构地区：[1]Nanjing Institute of Geology and Palaeontology, Chinese Academy of Sciences, Nanjing 210008, China [2]Shenyang Institute of Geology and Mineral Resources, Ministry of National Land and Resources, Shenyang 110034, China [3]Palaeontological Institute of Shenyang Normal University, Shenyang 110034, China

出　　处：《Chinese Science Bulletin》2010年第34期3864-3867,共4页

基　　金：supported by the Knowledge Innovation Program of the Chinese Academy of Sciences,(KZCX2-YW-154);the National Basic Research Program of China(2006CB701400)

摘　　要：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 attributed to the genus Ashicaulis on the basis of its anatomy.The sterile pinnae are referable to Cladophlebis,the fertile pinnules are of the Todites type with in situ spores of the Osmundacidites type.Osmundaceous rhizomes have been found all over the world including the Jurassic strata of western Liaoning,China.Until now,however,no rhizomes have been reported to be organically connected with leafy organs.Although impressions and compressions of isolated osmundaceous sterile and fertile fronds are common,they were described under separate organ-or morpho-generic names,such as Todites and Cladophlebis.The new discovery provides an opportunity to study an osmundaceous fern in 'whole plant concept' to learn more about its morphology and structure,and the pa-leoclimatic and paleoenvironmental requrirements of this group.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 attributed to the genus Ash# caulis on the basis of its anatomy. The sterile pinnae are referable to Cladophlebis, the fertile pinnules are of the Todites type with in situ spores of the Osmundacidites type. Osmundaceous rhizomes have been found all over the world including the Jurassic strata of western Liaoning, China. Until now, however, no rhizomes have been reported to be organically connected with leafy organs. Although impressions and compressions of isolated osmundaceous sterile and fertile fronds are common, they were described under separate organ- or morpho-generic names, such as Todites and Cladophlebis. The new discovery provides an opportunity to study an osmundaceous fern in ＇whole plant concept＇ to learn more about its morphology and structure, and the paleoclimatic and paleoenvironmental requrirements of this group.

关 键 词：原位孢子 侏罗纪 根茎 不育 辽西 蕨类植物 髫髻山组 中侏罗统 

分 类 号：P534.52[天文地球—古生物学与地层学] Q914.85[天文地球—地质学]