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首页> 外文期刊>International journal of plant sciences >MEGASPORES AND MICROSPORES OF THE EXTANT AND PALEOGENE MARSILEACEOUS FERN REGNELLIDIUM AND CRETACEOUS MOLASPORA: EVOLUTIONARY AND PHYTOGEOGRAPHIC IMPLICATIONS
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MEGASPORES AND MICROSPORES OF THE EXTANT AND PALEOGENE MARSILEACEOUS FERN REGNELLIDIUM AND CRETACEOUS MOLASPORA: EVOLUTIONARY AND PHYTOGEOGRAPHIC IMPLICATIONS

机译：现存的和古成纪的马齿状蕨类腺和白垩纪软体动物的微球和微孔：演化和植物地理学意义

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摘要

In common with the single extant species of the water fern Regnellidium, Regnellidium diphyllum, megaspores of Eocene and Oligocene representatives of this genus are characterized by having twisted, leaflike folds forming an acrolamella around the triradiate suture. The fossil and modern megaspores also have very similar wall ultrastructure and sculpture, and the morphology of the attached microspores of both is indistinguishable. Specimens of one of the species of the Cretaceous megaspore genus Molaspora-namely, Molaspora lobata, with attached microspores from Spain-and spores in the sporocarp Regnellidium upatoiensis from Georgia, United States, share some characters with those of extant Regnellidium, but the surface ornament of the microspores and the ultrastructure of the megaspore and microspore walls are different. The inner layer of the inner perine of M. lobata megaspores is thinner than the outer layer and of more compact, spongiose construction than that of Eocene and Oligocene Regnellidium spores from Eurasia and extant R. diphyllum. The microspores attached to or associated with M. lobata have a reticulate surface formed from muri of an outer perine layer and a thick, two-layered exine, whereas those of fossil and Recent Regnellidium have a closely packed rugulate-papillate sculpture and a thin exine that consists of a single, slightly spongiose layer. These characteristics, therefore, distinguish the Cretaceous fossils from Eocene-Recent members of this group. On the basis of available morphological characters of megaspores and microspores, M. lobata is interpreted as sister taxon to Regnellidium or to the Regnellidium + Pilularia clade. The geographically widespread records of Molaspora, some species of possibly related Arcellites, and fossil megaspores attributable to Regnellidium show that the parent plants of all of these reproductive organs were widely dispersed in the geological past and that the current distribution of Regnellidium-which is restricted to Brazil, Uruguay, and Argentina-is relict.
机译：与水蕨Regnellidium，Regnellidium diphyllum，该世代的始新世和渐新世的大孢子的单一现存物种相同，其特征是在三辐射缝合线周围形成了扭曲的叶状褶皱，形成了伞形菌。化石和现代大孢子也具有非常相似的壁超微结构和雕塑，并且两者的附着小孢子的形态是无法区分的。白垩纪大孢子属Molaspora的一种标本，即Molaspora lobata，带有来自西班牙的小孢子，以及美国乔治亚州的孢子皮Regnellidium upatoiensis的孢子，与现存的Regnellidium具有某些特征，但表面装饰小孢子的特征以及大孢子和小孢子壁的超微结构是不同的。球形的M. lobata大孢子的内会阴的内层比外层薄，并且比来自欧亚大陆的新世和渐新世的Regnellidium孢子更紧密，海绵状的结构。附着于或与球状念珠菌相关的小孢子具有网状表面，由多孔的会阴层和厚的两层外壁形成，而化石和近生的近孢子则具有紧密堆积的褶皱-pil回雕塑和薄的外壁它由一个略微海绵状的单层组成。因此，这些特征将白垩纪化石与该组的始新世-最近成员区分开。根据大孢子和小孢子的可用形态学特征，叶分枝杆菌被解释为Regnellidium或Regnellidium + Pulularia进化枝的姊妹分类群。 Molaspora，一些可能相关的Arcellite物种以及Regnellidium的化石大孢子在地理上的广泛分布记录表明，所有这些生殖器官的亲本植物广泛分散在地质历史中，并且Regnellidium的当前分布仅限于巴西，乌拉圭和阿根廷是遗物。

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  • 来源
    《International journal of plant sciences》 |2011年第9期|p.1087-1100|共14页
  • 作者

    David J. Batten; Margaret E. Collinson; Anthony P. R. Brain;

  • 作者单位

    School of Earth, Atmospheric, and Environmental Sciences, University of Manchester, Oxford Road, Manchester M13 9PL, United Kingdom, and Institute of Geography and Earth Sciences, Aberystwyth University, Ceredigion SY23 3DB, United Kingdom;

    Department of Earth Sciences, Royal Holloway University of London, Egham, Surrey TW20 OEX, United Kingdom;

    Centre for Ultrastructural Imaging, King's College London, New Hunts House, Guy's Campus, London Bridge, London SE1 1UL, United Kingdom;

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  • 正文语种 eng
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  • 关键词

    cretaceous; cenozoic; marsileaceae; megaspores; microspores; exine; perine; ultrastructure;

    机译：白垩纪新生代s科大孢子;小孢子外ine会阴超微结构;
  • 入库时间 2022-08-18 03:45:41

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