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首页> 外文期刊>International journal of plant sciences >ANATOMICALLY PRESERVED MARATTIALEAN PLANTS FROM THE UPPER PERMIAN OF SOUTHWESTERN CHINA: THE TRUNK OF PSARONIUS LAOWUJIENSIS SP. NOV.
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ANATOMICALLY PRESERVED MARATTIALEAN PLANTS FROM THE UPPER PERMIAN OF SOUTHWESTERN CHINA: THE TRUNK OF PSARONIUS LAOWUJIENSIS SP. NOV.

机译：中国西南部上二叠统的非常规保存的海生植物：PSARONIUS LAOWUJIENSIS SP的树干。十一月

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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, ～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 Ω-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.
机译：沙生龙虾属的Marattialean树干。十一月根据中国南部贵州省盘县宣威组的上二叠统描述。标本最有可能代表躯干的下部，因为根壁炉的保留厚度略大于茎的直径。茎的分生组织排列成大约五个切向的石碑周期，但不在径向锉刀中。内分生细胞数量少，〜12-13，且排列松散。叶痕呈螺旋状发散，并以2/5的叶序排列。叶基维管构型由三股组成，包括大的U形，离心股，小的向心股和倒置的Ω形内部股。每个分生组织围绕一层或两层细胞层厚的血管束鞘。在每个周围的茎生腱束的向心凹内，有锚状的硬化性股。地面组织似乎由气孔薄壁组织组成，其中分泌腔分散在其中。束缚的根大部分具有七至九个protoxylem极。血管束鞘为一或两个细胞层厚。内皮层由气生薄壁实质组成。对本标本与来自中国南方二叠纪的已知莎草种类进行了详细的比较。我们的标本在许多方面都与旺旺王sar相似，但通过茎的地面组织结构和叶基血管构型可以清楚地区分两者，从而导致新物种P. laowujiensis的建立。这个标本。讨论了华南二叠纪物种的某些重要特征。华南二叠纪的物种特有的树形或锚形硬毛状构造在外围茎生铁束向心凹内。这些茎的分生组织和根的碑骨周围的永久性维管束鞘是这些物种的另一个显着特征。被某些作者称为“内部皮层”的类似组织也存在于一些来自欧美和华北植物区系的Psaronius中，但在这些情况下，其壁较薄且不如华南物种的维管束鞘。来自华南二叠纪的物种的叶基维管构型比其他地方的物种更多样化。

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  • 来源
    《International journal of plant sciences》 |2010年第6期|P.662-678|共17页
  • 作者

    Xiaoyuan He; Jianhua Jin; Shijun Wang; Xiaoping Fu; Nan Li; Yong Li;

  • 作者单位

    Sun Yat-Sen University, Guangzhou 510275, People's Republic of China;

    rnSun Yat-Sen University, Guangzhou 510275, People's Republic of China;

    rnState Key Laboratory of Systematic and Evolutionary Botany, Institute of Botany, Chinese Academy of Sciences, Beijing 100093, People's Republic of China State Key Laboratory of Palaeobiology and Stratigraphy, Nanjing Institute of Geology and Palaeontology, Chinese Academy of Sciences, Nanjing 210008, People's Republic of China;

    rnShenzhen Fairy Lake Botanical Garden, Shenzhen 518004, People's Republic of China;

    rnShenzhen Fairy Lake Botanical Garden, Shenzhen 518004, People's Republic of China;

    rnShenzhen Fairy Lake Botanical Garden, Shenzhen 518004, People's Republic of China;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Marattiales; Psaronius; anatomy; Permian; South China;

    机译：马拉蒂亚莱斯莎朗尼斯解剖学;二叠纪华南;
  • 入库时间 2022-08-18 03:45:40

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