摘要
本文描述了四川广元晚三叠世诺利克期的Lepidopteris鳞羊齿属的三种新种。植物体可见两次羽状复叶,枝茎上盖满了不规则泡肿状鳞片。小羽片对生或亚对生。叶表皮细胞多边形,细胞壁一般较直或微弯,气孔器公布于叶背(下)面较密集。广元的标本外部形态及表皮细胞、气孔器等特征与已知鳞羊齿属各种十分相似。但叶表皮具有一种长卵形特殊构造,位于中脉两侧呈羽状排列。这种特殊构造是与鳞羊齿属已知种特征最为突出的区别。本文还对产出时代和沉积环境进行了探讨。
In the typical section of the Xujiahe coal-bearing formation of Guangyuan the abundant plantfossils have been collected and studied. in many years, but no Lepidopleris was discovered. In 1974,one of us (Prof. Bian) collected a great amount of well preserved Lepidopleris from that section.Three new species have been studied and described by Wang and Lepidopleris stchuanensis. L.guangyuanensis and L. xujiaheensis are recognized. The age and the depositional environment of theplant. bearing bed are discussed.
关键词
晚三叠世
Lepidoteris
须家河组
Late Triassic
Xujiahe Formation
Lepidopleris sichnanensis
Lepidopleris guangyuanensis Lipidopleris xujiaheensis
