Protophyllocladoxylon jingyuanense sp.nov.,a Gymnospermous Wood of the Serpukhovian(Late Mississippian) from Gansu,Northwest China  

作　　者：ZHANG Yi WANG Jun LIU Lujun LI Nan 

机构地区：[1]Paleontological Institute of Shenyang Normal University, Shenyang 110034, China [2]Nanjing Institute of Geology and Paleontology, Chinese Academy of Sciences, Nanjing 210008, China [3]Shenzhen Fair Lake Botanical Garden, Shenzhen 518004, China

出　　处：《Acta Geologica Sinica(English Edition)》2010年第2期257-268,共12页地质学报（英文版）

基　　金：the Project 111 of China (B06008);the Project No.KZCX2-YW-105 of CAS, China;the NSFC Projects Nos.40872027,40621062, 40672015;the Major Basic Research Project(No. 2006CB806400) of MOST of China

摘　　要：A new species of gymnospermous fossil wood, Protophyllocladoxylon jingyuanense sp. nov., is described from the lower part of the Tsingyuan Formation （Serpukhovian/Late Mississippian）, near the coal mine of Ciyao, Gansu, northwestern China. The specimen is preserved only in silicified secondary xylem, while growth rings are absent. Pits in radial tracheidal walls are araucaroid in type, uniseriate, occasionally biseriate. Xylem rays are homogeneous, uniseriate, occasionally biseriate. Cross-field pits are simple, large, one to two in number. Axial parenchyma is absent. The anatomical characters and geographic distribution of Protophyllocladoxylon woods through geological ages are documented. Those species with axial parenchyma and without growth rings live in warm climate, whereas the species without axial parenchyma and with growth rings are present either in warm or cool climate. The ideal living climate for Protophyllocladoxylon woods is warm and wet. Our new species, as a fossil wood of Early Carboniferous, is likely the earliest known species of Protophyllocladoxylon.A new species of gymnospermous fossil wood, Protophyllocladoxylon jingyuanense sp. nov., is described from the lower part of the Tsingyuan Formation （Serpukhovian/Late Mississippian）, near the coal mine of Ciyao, Gansu, northwestern China. The specimen is preserved only in silicified secondary xylem, while growth rings are absent. Pits in radial tracheidal walls are araucaroid in type, uniseriate, occasionally biseriate. Xylem rays are homogeneous, uniseriate, occasionally biseriate. Cross-field pits are simple, large, one to two in number. Axial parenchyma is absent. The anatomical characters and geographic distribution of Protophyllocladoxylon woods through geological ages are documented. Those species with axial parenchyma and without growth rings live in warm climate, whereas the species without axial parenchyma and with growth rings are present either in warm or cool climate. The ideal living climate for Protophyllocladoxylon woods is warm and wet. Our new species, as a fossil wood of Early Carboniferous, is likely the earliest known species of Protophyllocladoxylon.

关 键 词：Protophyllocladoxylonjingyuanense growth rings axial parenchyma climate 

分 类 号：Q949.6[生物学—植物学] P445.4[天文地球—大气科学及气象学]