大羽羊齿植物是一个令人迷惑的类群，这类植物中，Gigantonoclea,Zeilleropteris和Cathaysiopteris是北美和东亚二叠纪植物群共有的3个属，但美国最早发现的大羽羊齿植物Gigantopteridium以前在中国的大羽羊齿植物群中未有确切记录，文中订正和详细描述Gigantopteridium的一个中国种，并对该属中国种的一些相关问题作详尽的讨论，美国大羽羊齿类植物采用小泉源一（Koidzumi,1936)，的分类系统，只依据叶脉特征进行分类，它是一人为分类系统（Mamay et al.,1988)，根据这一系统，文中涉及的中国和美国标本都应归入Gigantopteridium这一属内，这样，东亚和北美大羽羊齿植物群中的大羽羊齿类植物共同属的数目就由3个增加到4个，在对Gigantopteridium huapingense(Feng)详细描述和订正的基础上，对Gigantopteridium中国种与美国种在叶结构方面的异同进行较为详细的比较，虽然此属目前尚未发现过生殖器官和保存解剖结构的材料。

Among the enigmatic plant group gigantopterids, three genera, Gigantonoclea, Zeilleropteris and Cathaysiopteris, are shared by the American and the Asian Permian floras, but the first recorded American gigantopterid Gigantopteridium has not been described formally in the Gigantopteris flora of China up to now. In the present article a Chinese species of Gigantopteridium is described in detail, and a new emendation is made. Furthermore, some relevant problems about the Chinese species of Gigantopteridium are discussed at some length. The system of Koidzumi (1936) adopted in the classification of the American gigantopterids is an artificial grouping, held together only by characters of venation (Mamay et al ., 1988). According to this system the Chinese and the American specimens here concerned should be ascribed to the genus Gigantopteridium . Thus, the common genera in the Gigantopteris flora of North America and East Asia have increased from three to four. The similarity and difference between the American and the Chinese species of Gigantopteridium are compared in the leaf architecture, although no reproductive organs and anatomical data of Gigantopteridium have been provided for the time being.

Q914.85

国家自然科学基金 (No .40 172 0 0 1)资助课题~~