Additional observations on Zosterophyllum yunnanicum Hsu from the Lower Devonian of Yunnan, China

doi:10.1016/j.revpalbo.2015.03.007

	Additional observations on Zosterophyllum yunnanicum Hsu from the Lower Devonian of Yunnan, China
	Edwards, Dianne ; Yang, Nan ; Hueber, Francis M.; Li, Cheng-Sen
	2015
发表期刊	REVIEW OF PALAEOBOTANY AND PALYNOLOGY
ISSN	0034-6667
卷号	221 页码:220-229
摘要	Investigation of unfigured specimens in the original collection of Zosterophyllum yunnanicum Hsu, 1966 from the Lower Devonian (upper Pragian to basal Emsian) Xujiachong Formation, Qujing District, Yunnan, China has provided further data on both sporangial and stem anatomy. We show that the sporangia dehisced into more or less equal valves through a mechanism that involved the development of large thick-walled cells. Furthermore the coalified xylem is composed of tracheids with G-type thickenings (predominantly annular secondary thickenings with small circular to irregular perforations in the intervening wall), confirming the presence of this form of vascular element in the genus Zosterophyllum. The species diagnosis is emended. Characterisation of dehiscence mechanisms in fossil sporangia is complicated by their different modes of preservation. A brief critical survey of the marginal features in bivalved sporangia in zosterophylls and other selected species is followed by a discussion on their putative functional significance. Preservation notwithstanding, we identify clear differences in mechanisms related to the nature of the underlying cellular structure of the dehiscence feature. The distinctive groove present in many species might represent a mechanism for regulating the timing of dehiscence in response to atmospheric conditions. (C) 2015 Elsevier B.V. All rights reserved.
关键词	Zosterophyllum yunnanicum Sporangial border Dehiscence Early Devonian Yunnan Province
学科领域	Plant Sciences ; Paleontology
DOI	10.1016/j.revpalbo.2015.03.007
收录类别	SCI
语种	英语
WOS关键词	EARLY LAND PLANTS ; OLD RED SANDSTONE ; POSONGCHONG FORMATION ; SOUTH-WALES ; BIOSTRATIGRAPHIC METHOD ; XUJIACHONG FORMATION ; NORTHEASTERN YUNNAN ; WELSH BORDERLAND ; XITUN FORMATION ; COMPLEX-PLANT
WOS研究方向	Science Citation Index Expanded (SCI-EXPANDED)
WOS记录号	WOS:000361777900022
出版者	ELSEVIER SCIENCE BV
文献子类	Article
出版地	AMSTERDAM
EISSN	1879-0615
资助机构	Chinese Academy of Sciences [2013T2S0022] ; Royal Society
作者邮箱	EdwardsD2@cardiff.ac.uk
作品OA属性	Green Accepted
引用统计	被引频次：9[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/2S10CLM1/25702
专题	系统与进化植物学国家重点实验室
作者单位	1.Cardiff Univ, Sch Earth & Ocean Sci, Cardiff CF10 3AT, S Glam, Wales 2.Chinese Acad Sci, Inst Bot, Beijing 100093, Peoples R China 3.Hueber, Francis M.] Smithsonian Inst, Natl Museum Nat Hist, Washington, DC 20560 USA
推荐引用方式 GB/T 7714	Edwards, Dianne,Yang, Nan,Hueber, Francis M.,et al. Additional observations on Zosterophyllum yunnanicum Hsu from the Lower Devonian of Yunnan, China[J]. REVIEW OF PALAEOBOTANY AND PALYNOLOGY,2015,221:220-229.
APA	Edwards, Dianne,Yang, Nan,Hueber, Francis M.,&Li, Cheng-Sen.(2015).Additional observations on Zosterophyllum yunnanicum Hsu from the Lower Devonian of Yunnan, China.REVIEW OF PALAEOBOTANY AND PALYNOLOGY,221,220-229.
MLA	Edwards, Dianne,et al."Additional observations on Zosterophyllum yunnanicum Hsu from the Lower Devonian of Yunnan, China".REVIEW OF PALAEOBOTANY AND PALYNOLOGY 221(2015):220-229.

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