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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较详尽的讨论。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 ,它是一个人为分类系统 (Mamayetal.,1988)。根据这一系统 ,文中涉及的中国和美国标本都应归入Gigantopteri dium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Gigantopteridiumhuapingense(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。
Oda fern is a fascinating group. Among these plants, Gigantonoclea, Zeilleropteris and Cathaysiopteris are three common genera in the Permian flora of North America and East Asia. However, Gigantopteridium, the earliest discovered fern in the United States, was not previously recorded in the genus Datuidae in China. A Chinese species of Gigantopteridium is revised and described in detail, and some related issues of the genus Chinese are discussed in detail. The genus Umhlangie is based on the classification system of Koidzumi (1936) and is classified according to the characteristics of the veins only. It is an artificial classification system (Mamay et al., 1988). According to this system, both the Chinese and American specimens involved in the article should be included in the genus Gigantopteri dium. As a result, the number of common genera in Greater Feather fern in East Asia and North America increased from 3 to 4. Based on the detailed description and revision of Gigantopteridium huapingense (Feng), the similarities and differences in leaf structure between Chinese and American species of Gigantopteridium have been compared in detail, although no genital and anatomical materials have yet been found.