Anatomically Preserved Marattialean Plants from the Upper Permian of Southwestern China: The Trunk of Psaronius laowujiensis sp. nov.
Anatomically Preserved Marattialean Plants from the Upper Permian of Southwestern China: The Trunk of Psaronius laowujiensis sp. nov.
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DOI：
10.1086/653144
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发表时间：
2010-07
影响因子：
2.3
通讯作者：
He Xiaoyuan;Jing Jianhua;Wang Shi-jun;Fu Xiaoping;L. Nan;Li Yong
中科院分区：
文献类型：
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作者：
He Xiaoyuan;Jing Jianhua;Wang Shi-jun;Fu Xiaoping;L. Nan;Li Yong
描述了贵州盘县上二叠统宣威组一个马拉提亚类化石Psaronius laowujiensis sp. nov.。该标本最有可能代表树干的下部，因为保存的根套厚度略大于茎的直径。茎的分生组织排列在大约五个切向的中柱循环中，但不是在径向文件。内部分生组织数量少，约12-13个，排列松散。叶迹呈螺旋状发散，并在2/5叶序中组织。叶基维管结构由三股组成，包括一根大的U形离心股、一根小的向心股和一根倒Ω形的内部股。一个或两个细胞层厚的维管束鞘包围着每个分生组织。在每一个外周茎束的向心轴中，有锚形的厚壁组织束。基本组织似乎由通气薄壁组织组成，...
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, ...