中文摘要：

Baiera叶部化石是欧亚大陆中生代植物群中的常见分子，广泛分布于晚三叠世一早白垩世地层中。本文根据首次发现于内蒙古海拉尔地区五九盆地下白垩统大磨拐河组的多块保存完好角质层的Baiera叶部压型标本的形态学和表皮构造研究，建立了一个新种一两叉状拜拉（新种）（Baiera bifurcata sp．nov．）。

英文摘要：

The fossils of Baiera leaves are diverse and widespread in the Mesozoic, especially in the Late Triassic-Early Cretaceous flora in the Northern Hemisphere, Based upon compression specimens of Baiera col- lected from Damoguaihe Formation of Lower Cretaceous in the studied area, and their leaf morphology and wellpreserved cuticular characters, a new species is found for the first time and named as Baiera bifurcata sp. nov. The discovery of this new species in the Early Cretaceous significantly extends the stratigraphic and geographic distribution of Baiera, and is important for the reconstruction of Cretaceous environments.