A New Specis of the Isolated Psaroniaceous Rachis from the 一种新的分离psaroniaceous轴从.docVIP

下载本文档

4
0
约3.42万字
约 10页
2018-06-19 发布于福建
举报
版权申诉

A New Specis of the Isolated Psaroniaceous Rachis from the 一种新的分离psaroniaceous轴从.doc

1、有哪些信誉好的足球投注网站（book118）网站文档一经付费（服务费），不意味着购买了该文档的版权，仅供个人/单位学习、研究之用，不得用于商业用途，未经授权，严禁复制、发行、汇编、翻译或者网络传播等，侵权必究。。
2、本站所有内容均由合作方或网友上传，本站不对文档的完整性、权威性及其观点立场正确性做任何保证或承诺！文档内容仅供研究参考，付费前请自行鉴别。如您付费，意味着您自己接受本站规则且自行承担风险，本站不退款、不进行额外附加服务；查看《如何避免下载的几个坑》。如果您已付费下载过本站文档，您可以点击这里二次下载。
3、如文档侵犯商业秘密、侵犯著作权、侵犯人身权等，请点击“版权申诉”（推荐），也可以打举报电话：400-050-0827(电话支持时间：9:00-18:30)。
4、该文档为VIP文档，如果想要下载，成为VIP会员后，下载免费。
5、成为VIP后，下载本文档将扣除1次下载权益。下载后，不支持退款、换文档。如有疑问请联系我们。
6、成为VIP后，您将拥有八大权益，权益包括：VIP文档下载权益、阅读免打扰、文档格式转换、高级专利检索、专属身份标志、高级客服、多端互通、版权登记。
7、VIP文档为合作方或网友上传，每下载1次，网站将根据用户上传文档的质量评分、类型等，对文档贡献者给予高额补贴、流量扶持。如果你也想贡献VIP文档。上传文档

A New Specis of the Isolated Psaroniaceous Rachis from the 一种新的分离psaroniaceous轴从

A New Species of the Isolated Psaroniaceous Rachis from the Early Permian in China Ning Xiang 1,2, Shi-Min Ma 3, Bao-Lin Tian 3 and Shi-Jun Wang 1* State Key Laboratory of Systematic and Evolutionary Botany, Institute of Botany, the Chinese Academy of Sciences, Beijing 100093, China; 2. Graduate University of the Chinese Academy of Sciences, Beijing 100049, China; 3. China University of Mining and Technology, Beijing 100083, China) Received : 12 Oct.2006 Accepted 24 Apr. 2007 Handling editor: Cheng-Sen Li Category: Evolution Author for correspondence . Tel:+86 (0) 1062836435 E-mail:wangsj@ibcas.ac.cn Supported by the National Natural Foundation of China and the Special Fund from the Director of Institute of Botany, CAS. Abstract A new kind of marattialean raches are reported from the coal balls in Coal Seam No.7 in the upper part of Taiyuan Formation (early Early Permian) from Taiyuan, Shanxi, China and are assigned to the genus Stipitopteris Grand’Eury (Psaroniaceae). The present specimens are different from all the six reported species of the genus thus to be erected as a new species: Stipitopteris shanxiensis. The raches of the new species are generally dorsi-ventrally flattened. Main raches usually exhibit scales of different forms on their surface. Beneath the epidermis is a zone of parenchymatous cells some of which contain tannin-like contents. Inside this is a zone of small sclerenchymatous cells. Inward are the ground tissue and vascular bundles. The vascular bundles are continuous and are in two circles: outer circle assumes a transversely elliptical shape with the gap and pinna trace; and inner circle assumes a shallow “C” shape with enrolled ends. The ground tissue located at the inner side of the vascular bundle is composed of thicker-walled parenchymatous cells. The cells of the ground tissue are vertically elongated in longitudinal section. Subordered raches are smaller and have simpler structures than the main raches. T