Tiania yunnanense gen. et sp nov., an osmundalean stem from the Upper Permian of southwestern China previously placed within Palaeosmunda

doi:10.1016/j.revpalbo.2014.07.004

	Tiania yunnanense gen. et sp nov., an osmundalean stem from the Upper Permian of southwestern China previously placed within Palaeosmunda
	Wang, Shi-Jun ; Hilton, Jason 2; Galtier, Jean 3; He, Xiao-Yuan ; Shao, Long-Yi
	2014
发表期刊	REVIEW OF PALAEOBOTANY AND PALYNOLOGY
ISSN	0034-6667
卷号	210 页码:37-49
摘要	The Permian aged osmundalean fern Palaeosmunda yunnanense Tian et Chang has been re-investigated based on the original specimens and demonstrated to represent a new genus within the extinct family Guaireaceae that we name Tiania yunnanense (Tian et Chang) gen. et. comb. nov. The stem of T. yunnanense is small, c. 30 mm in diameter, and comprises an ectophloic siphonostele without leaf gaps. Pith is bilayered and consists of longitudinally elongated cells. Cortex is not differentiated into an inner parenchymatous and outer sclerenchymatous zone characteristic of members of the Osmundaceae, and possesses longitudinally elongated cells and large secretory cells. Leaf traces are numerous (>100) and adaxially curved, with two endarch protoxylem strands upon departing the stele, increasing to more than four protoxylem strands as the trace passes the cortex, all distributed along the adaxial side of the leaf trace. Leaf traces have more-or-less incurved lateral tips, and are encircled by a vascular bundle sheath. A mass of thick-walled, longitudinally elongated cells occur in the adaxial concavity of the leaf trace. Adventitious roots arise singly from the abaxial and lateral margin of individual departing leaf traces, and extend in a sinuous manner horizontally and longitudinally. Abundant tyloses-like contents occur in cells of the cortex and represent the first account of these within fossil Osmundales, but unlike other plant groups in which they occur within xylem, fibre-tracheids and lactifers, in T. yunnanense they occur in longitudinally elongated cortex cells where they presumably impeded fungal hyphae growth. Radially aligned 'secondary' parenchyma within the stem appears to represent a wound reaction in the cortex in the living plant Due to its siphonostele without leaf gaps, Tiania is interpreted as an evolutionary intermediate between the protostelic thamnopterids and the more advanced dictyostelic osmundaleans. Biogeographic implications of Tiania are discussed from which it is concluded that the osmundalean diversity from the Late Permian of South China is unusually high and that these plants are likely to play an increasingly important rote in our understanding of the early evolutionary history and systematic relationships of the Osmundales. (C) 2014 Elsevier B.V. All rights reserved.
关键词	Osmundales Guaireaceae Tylosis Wound reaction Xuanwei Formation Volcaniclastic tuff
学科领域	Plant Sciences ; Paleontology
DOI	10.1016/j.revpalbo.2014.07.004
收录类别	SCI
语种	英语
WOS关键词	TYLOSES
WOS研究方向	Plant Sciences ; Paleontology
WOS记录号	WOS:000343847100003
出版者	ELSEVIER SCIENCE BV
文献子类	Article
出版地	AMSTERDAM
EISSN	1879-0615
资助机构	CAS project [KZCX2-EW-120] ; National Natural Science Foundation of China [41030213, 41172014, 41162001] ; State Key Laboratory of Palaeobiology and Stratigraphy (Nanjing Institute of Geology and Palaeontology, CAS) [073103, 133116]
作者邮箱	wangsj@ibcas.ac.cn
作品OA属性	Green Submitted
引用统计	被引频次：19[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.ibcas.ac.cn/handle/2S10CLM1/27191
专题	系统与进化植物学国家重点实验室
作者单位	1.Chinese Acad Sci, Inst Bot, State Key Lab Systemat & Evolutionary Bot, Beijing 100093, Peoples R China 2.Chinese Acad Sci, Nanjing Inst Geol & Palaeontol, State Key Lab Palaeobiol & Stratig, Nanjing 210008, Jiangsu, Peoples R China 3.Univ Birmingham, Sch Geog Earth & Environm Sci, Birmingham B15 2TT, W Midlands, England 4.CIRAD, Unite Mixte Rech Bot & Bioinformat Architecture P, F-34398 Montpellier, France 5.Yunnan Univ, Yunnan Key Lab Palaeobiol, Kunming 650091, Peoples R China 6.China Univ Min & Technol, Sch Geosci & Surveying Engn, State Key Lab Coal Resources & Safe Min, Beijing 100083, Peoples R China
推荐引用方式 GB/T 7714	Wang, Shi-Jun,Hilton, Jason,Galtier, Jean,et al. Tiania yunnanense gen. et sp nov., an osmundalean stem from the Upper Permian of southwestern China previously placed within Palaeosmunda[J]. REVIEW OF PALAEOBOTANY AND PALYNOLOGY,2014,210:37-49.
APA	Wang, Shi-Jun,Hilton, Jason,Galtier, Jean,He, Xiao-Yuan,&Shao, Long-Yi.(2014).Tiania yunnanense gen. et sp nov., an osmundalean stem from the Upper Permian of southwestern China previously placed within Palaeosmunda.REVIEW OF PALAEOBOTANY AND PALYNOLOGY,210,37-49.
MLA	Wang, Shi-Jun,et al."Tiania yunnanense gen. et sp nov., an osmundalean stem from the Upper Permian of southwestern China previously placed within Palaeosmunda".REVIEW OF PALAEOBOTANY AND PALYNOLOGY 210(2014):37-49.

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