The fossil specimens of Metasequoia Miki, aged in early Eocene was collected from Guchengzi and Jijuntun Formations of Fushun, Liaoning Province, Northeast China. Female and male cones and nutricious shoots, together with leafy epidermis and epidermis of staminal bract were investigated and here by described in details. The specimens is attributed to M. occidentalis after comparing them with M. glyptostroboides, M. milleri and M. occidentalis, considering the characteristics of leaves, female and male cones, epidermal cells and stomata. The average stomatal density of M. glyptostroboides in the stomatal distributional regions is measured to be 183.85/mm2, that of Fushun specimens 140.13/mm2; the average stomatal index of M. glyptostroboides in the stomatal distributional regions is 10.79, that of Fushun specimens is 9.48.
中国辽宁省始新世水杉的研究
刘艳菊1,2 李承森1
（1. 中国科学院植物研究所，北京100093；2. 北京市物理化学分析测试中心，北京100089）
摘要：以辽宁省抚顺早始新世古城子组和计军屯组的水杉 (Metasequoia Miki)为研究对象 ,对其雌球果、雄球花枝和营养枝叶的形态、叶表皮和雄球花苞片表皮的结构进行了研究分析 ,并与M .glyptostroboides,M .occidentalis,M .milleri的性状进行比较 ,认定其属于M .occidentalis。并测得M .glyptostroboides和抚顺水杉叶下表皮气孔分布区内的平均气孔密度和平均气孔指数。在气孔分布区内 ,M .glyptostroboides的平均气孔密度为 1 83.85个 /mm2 ,平均气孔指数为 1 0 .79;而抚顺标本叶的平均气孔密度为 1 4 0 .1 3个 /mm2 ,平均气孔指数为 9.48。
关键词： 辽宁抚顺；始新世；水杉
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