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TANG Biao,HAN Meng,XU Qingqing,JIN Jianhua.2016.Leaf Cuticle Microstructure of Machilus maomingensis sp. nov. (Lauraceae) from the Eocene of the Maoming Basin, South China[J].Acta Geologica Sinica(),90(5):1561-1571
Leaf Cuticle Microstructure of Machilus maomingensis sp. nov. (Lauraceae) from the Eocene of the Maoming Basin, South China    Download PDF
TANG Biao  HAN Meng  XU Qingqing  JIN Jianhua
This study was supported by the National Natural Science Foundation of China (Grant No. 41210001), State Key Laboratory of Palaeobiology and Stratigraphy (Nanjing Institute of Geology and Palaeontology, CAS) (Grant No. 123110), the Fundamental Research Funds for the Central Universities (Grant No. 16lgjc28), and the Scientific Research Fund, Hongda Zhang, Sun Yat-sen University. The graduate students majoring in Plant Science at Sun Yat-sen University participated in the field collection of the fossil. We thank Zheng Ping, College of Life Sciences, South China Agricultural University for preparing semi-thin sections. We also thank Prof. Robert Spicer (The Open University) and Ms. Margaret Joyner (USA) for improving the manuscript.
DOI:
Abstract:
      Machilus maomingensis Jin et Tang, sp. nov. from the Eocene Youganwo Formation of the Maoming Basin, South China, is studied in detail from the perspective of the leaf architecture and the excellently preserved cuticle. The leaf margin is entire, the primary venation is pinnate; 6 to 8 secondary veins are present and the major secondary venation is eucamptodromous. Stomata are paracytic and occur on the lower epidermis. Trichome bases are unicellular. Oil cells are present in the upper epidermis. The new fossil species described has features of the Lauraceae, particularly of the extant genus Machilus Rumphius ex Nees, and it is most similar to Machilus chinensis (Bentham) Hemsley, an extant species distributed in southern China and Vietnam. Hence, Machilus maomingensis sp. nov. is inferred to live in a warm and humid climate. The discovery of the present fossil indicates that Machilus has existed in South China from at least the Eocene.
Key words:Machilus maomingensis, cuticle, Eocene, Maoming Basin, South China
Leaf Cuticle Microstructure of Machilus maomingensis sp. nov. (Lauraceae) from the Eocene of the Maoming Basin, South China    Download Fulltext
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