山东早二叠世早期太原组煤核中美丽“鳞木”的解剖构造(英文)

来源 :Acta Botanica Sinica | 被引量 : 0次 | 上传用户:furong2599
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描述了山东兖州矿区太原组(早二叠世早期)煤核中一种具叶座的鳞木类茎的解剖构造。叶座呈略不对称的菱形,下侧边略长于上侧边,顶、底角均平截,底角并略呈拖延状;叶座上部突起较强烈,叶痕双凸镜形,叶迹呈宽V字形,叶迹与侧通气束可能都以近水平状在叶座内向外延伸:叶舌穴深,自叶座最内处向外斜伸,开口位于叶痕顶角附近。叶座底部表面具横皱纹。茎可能具管状中柱和薄壁组织的髓。初生木质部外始式,外缘较平滑。仅见有外部皮层,由径向伸长的壁较厚的细胞条带和夹于其间的空腔交替排列构成,空腔内可见弧形或宽V字形叶迹,其凹面朝向内方。周皮较发育,由近等量发育的木栓层和栓内层组成。经比较,当前标本与华夏植物区的印痕——压型化石种美丽鳞木在叶座的形态上非常相似,暂归入该种。由于无论是当前标本还是美丽鳞木的模式标本与狭义的鳞木属都有很大区别,因此美丽“鳞木”的确切归属还有待于今后进一步对保存更好的具解剖构造的茎和生殖器官的研究。美丽“鳞木”与欧美植物区几个乔木状鳞木类植物属的茎都不完全相同,具有它们的混合特征,很可能代表了一个新属。美丽“鳞木”是目前华夏植物区研究得最详细的一种具解剖构造的鳞木类的茎,对于研究华夏植物区鳞木类植物的起源和演化具有一定的意义。 Describe the anatomy of a lepidopteran stem in the coal core of the Taiyuan Formation (Early Permian) in the Yanzhou Mining Area, Shandong Province. Leaf base was a slightly asymmetric rhombus, the lower side slightly longer than the upper side, top and bottom corners are cut off, the bottom corner and slightly delayed shape; Was wide V-shaped, leaves and lateral ventilation beam may be nearly horizontally within the blade seat outward extension: Lobe deep hole, outwardly extending from the inner most leaf seat oblique, the opening is located near the top of the leaf mark. Leaf surface at the bottom of the seat with horizontal wrinkles. Stems may have tubular medulla and parenchymatous pulp. Beginning of the xylem outer edge, the outer edge of a more smooth. Only an outer cortex is seen, alternating with thicker cell strands extending radially from the walls and cavities sandwiched between them, with curved or broad V-shaped lobes visible in the cavity, with the concave side facing inward. Peripapillary more developed by the same amount of development of the cork layer and the inner layer of the bolt composition. By comparison, the current specimen and the Huaxia flora imprint - compression type fossil species beautiful scales in the leaf seat morphology is very similar, temporarily classified into the species. As both the current specimens and the beautiful specimens of the scales are very different from the narrow scales, the exact assignment of the beautiful “scales” remains to be further studied in the future to conserve better anatomical stems and reproductive Organ research. Beautiful “scales wood” and Europe and the United States flora several species of arboreous scales wood genus are not exactly the same, with their mixed features, it may represent a new genus. The beautiful “Larch” is the most detailed anatomical structure of the scaly wood species in the Huaxia Botanical Zone, which is of great significance to the study of the origin and evolution of the Larch species in the Chinese flora.
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