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在我国二叠纪植物群中,Protoblechnum及其与类似植物如Compsopteris,Glenopteris和Supaia等之间的关系,是一个长期争论至今尚未完全解决的问题。70年前,Halle在研究我国山西晚古生代植物化石时,曾将石盒子组中的一些一次羽状分裂的蕨叶标本归于Proto-blechnum属,并定名为Protoblechnum wongii Halle。他在讨论Protoblechnum与相关化石的区别时并未把蕨叶羽轴的分叉与否当成一个重要的属级划分条件。Zalessky在研究俄罗斯二叠纪植物化石时也发现了和中国的Protoblechnum十分类似的标本,但他不赞同使用Protoblechnum属名,而将羽轴分叉的标本归于White创建的Supaia属中,将羽轴不分叉、蕨叶为一次羽状的标本归于他创立的新属——Compsopteris内。
Among the Permian flora in our country, Protoblechnum and its relationship with similar plants such as Compsopteris, Glenopteris and Supaia are among the issues that have not yet been completely solved in the long term. Seventy years ago, when studying the late Palaeozoic plant fossils in Shanxi Province, Halle once classified some of the pinnate fern leaf samples from Protolithium genus as Proto-blechnum and named Protoblechnum wongii Halle. His discussion of the differences between Protoblechnum and related fossils did not consider the bifurcation of the fern leaf axis as an important subclass condition. Zalessky also found specimens similar to Protoblechnum in China during the study of Permian plant fossils in Russia. However, he disagreed with the genus Protoblechnum and the bifurcated specimens of rachises were assigned to Supaia, which was created by White. Without bifurcation, the fern leaf is a plume of specimens belonging to the new genus he founded - within the Compassopteris.