摘要
本文描述了四川早泥盆世陆地植物的一个新属种——江油抱囊蕨(Amplectosporangiumjiangyouense)。植物体茎轴裸露,等或不等二歧式分枝多次,在其远端区密集的二歧式分枝构成了一个椭圆状或梨状轮廓的能育顶枝系。孢子囊椭圆形,具短柄,呈单列侧生于能育枝的内侧。根据新植物显示的形态特征,除与一些早期陆地维管植物作了比较外,还初步探讨了它与种子植物珠被演化间的关系。
A new genus and species Amplectosporangium jiangyouense,is described from the Pingyipu Formation(Siegenian)of the Lower Devonian in Jiangyou district, Sichuan,China.The plant consists of naked dichotomizing erect axes with termi- nal fertile branch-systems Sporangia are oval-shaped each with a short stalk and are arranged along the inner side of dichotomized axes in single row.By compa- rison with other known Devonian plants the genus is considered to represent anew morphological type of early land plants.Based on the theory of the telomic ori- gin of the ovular integument,the plant may represent an early stage in the evo- lution of integument.
基金
国家自然科学基金和中国科学院青年奖励研究基金联合
关键词
早泥盆世
能育枝系
抱囊蕨属
Lower Devonian
Fertile branch-system
Lateral sporangia
