ANATOMICALLY PRESERVED MARATTIALEAN PLANTS FROM THE UPPER PERMIAN OF SOUTHWESTERN CHINA: THE TRUNK OF PSARONIUS LAOWUJIENSIS SP NOV.

doi:10.1086/653144

	ANATOMICALLY PRESERVED MARATTIALEAN PLANTS FROM THE UPPER PERMIAN OF SOUTHWESTERN CHINA: THE TRUNK OF PSARONIUS LAOWUJIENSIS SP NOV.
	He, Xiaoyuan 2; Jin, Jianhua 2; Wang, Shijun 1,3; Fu, Xiaoping 4; Li, Nan 4; Li, Yong 4
	2010-07-01
发表期刊	INTERNATIONAL JOURNAL OF PLANT SCIENCES
ISSN	1058-5893
卷号	171 期号:6 页码:662-678
摘要	A marattialean trunk of Psaronius laowujiensis sp. nov. is described from the Upper Permian of the Xuanwei Formation, Panxian County, Guizhou Province, South China. The specimen most likely represents the lower part of the trunk, because the preserved thickness of the root mantel is somewhat larger than the diameter of the stem. Meristeles of the stem are arranged in approximately five tangential stelar cycles but not in radial files. Inner meristeles are in small number, similar to 12-13, and loosely arranged. Leaf traces diverge helically and are organized in a 2/5 phyllotaxy. The leaf base vascular configuration consists of three strands that include a large U-shaped, centrifugal strand, a small centripetal strand, and an inverted V-shaped internal strand. A vascular bundle sheath one or two cell layers thick surrounds each meristele. Within the centripetal concavity of each peripheral cauline bundle there are anchor-shaped sclerenchymatous strands. Ground tissue appears to consist of aerenchymatous parenchyma, in which secretory cavities are dispersed. Bound roots mostly possess seven to nine protoxylem poles. The vascular bundle sheath is one or two cell layers thick. The inner cortex consists of aerenchymatous parenchyma. A detailed comparison of the present specimen with known species of Psaronius from the Permian of South China is made. Our specimen is similar to Psaronius wangii in many aspects, but the two can be clearly distinguished by the structure of the ground tissue of the stem and the leaf base vascular configuration, which leads to the erection of a new species, P. laowujiensis, for this specimen. Certain important characters in species from the Permian of South China are discussed. The tree-or anchor-shaped sclerenchymatous configuration within the centripetal concavity of the peripheral cauline bundles is unique to species from the South China Permian. The permanent vascular bundle sheath surrounding the meristeles of the stem and the stele of the root is another remarkable feature of those species. The analogous tissue, termed "inner cortex" by certain authors, is also present in some Psaronius from the Euramerican and North China floras, but in those cases it is thinner walled and not as remarkable as the vascular bundle sheath in the species from South China. The leaf base vascular configuration of the species from the Permian in South China is more diverse than those from other places.
关键词	Marattiales Psaronius anatomy Permian South China
DOI	10.1086/653144
语种	英语
关键词[WOS]	SOUTHERN CHINA ; FERN
资助项目	National Natural Science Foundation of China[30670140] ; State Key Laboratory of Palaeobiology and Stratigraphy, NIGP, CAS[073103] ; China Postdoctoral Science Foundation[20090460820]
WOS研究方向	Plant Sciences
WOS类目	Plant Sciences
WOS记录号	WOS:000279042600004
项目资助者	National Natural Science Foundation of China ; State Key Laboratory of Palaeobiology and Stratigraphy, NIGP, CAS ; China Postdoctoral Science Foundation
出版者	UNIV CHICAGO PRESS
文献类型	期刊论文
条目标识符	http://ir.nigpas.ac.cn/handle/332004/357
专题	中国科学院南京地质古生物研究所
通讯作者	Wang, Shijun
作者单位	1.Chinese Acad Sci, Inst Bot, State Key Lab Systemat & Evolutionary Bot, Beijing 100093, Peoples R China 2.Sun Yat Sen Univ, Guangzhou 510275, Guangdong, Peoples R China 3.Chinese Acad Sci, Nanjing Inst Geol & Palaeontol, State Key Lab Palaeobiol & Stratig, Nanjing 210008, Peoples R China 4.Shenzhen Fairy Lake Bot Garden, Shenzhen 518004, Peoples R China
通讯作者单位	中国科学院南京地质古生物研究所
推荐引用方式 GB/T 7714	He, Xiaoyuan,Jin, Jianhua,Wang, Shijun,et al. ANATOMICALLY PRESERVED MARATTIALEAN PLANTS FROM THE UPPER PERMIAN OF SOUTHWESTERN CHINA: THE TRUNK OF PSARONIUS LAOWUJIENSIS SP NOV.[J]. INTERNATIONAL JOURNAL OF PLANT SCIENCES,2010,171(6):662-678.
APA	He, Xiaoyuan,Jin, Jianhua,Wang, Shijun,Fu, Xiaoping,Li, Nan,&Li, Yong.(2010).ANATOMICALLY PRESERVED MARATTIALEAN PLANTS FROM THE UPPER PERMIAN OF SOUTHWESTERN CHINA: THE TRUNK OF PSARONIUS LAOWUJIENSIS SP NOV..INTERNATIONAL JOURNAL OF PLANT SCIENCES,171(6),662-678.
MLA	He, Xiaoyuan,et al."ANATOMICALLY PRESERVED MARATTIALEAN PLANTS FROM THE UPPER PERMIAN OF SOUTHWESTERN CHINA: THE TRUNK OF PSARONIUS LAOWUJIENSIS SP NOV.".INTERNATIONAL JOURNAL OF PLANT SCIENCES 171.6(2010):662-678.