二叠纪枝脉蕨型真蕨植物一新属——Lixotheca gen. nov.  

LIXOTHECA——A NEW GENERIC NAME FOR PERMIAN CLADOPHLEBOID FERN

作　　者：姚兆奇[1] 刘陆军[1] 张士[2] 

机构地区：[1]中国科学院南京地质古生物研究所,南京210008 [2]郑州煤田职工地质学院,郑州450053

出　　处：《古生物学报》1993年第5期525-539,653-656,共15页Acta Palaeontologica Sinica

基　　金：国家自然科学基金

摘　　要：根据生殖器官类型,继将二叠枝脉蕨(cladophlebis permica Lee et Wang)的华南标本改归天石蕨属(Szea)之后,为该种的华北标本另建了-新的属名——李氏蕨属(Lixotheca),并再次表述了该种华南标本改归Szea的理由.根据对孢子囊群、孢子囊及孢子结构的研究,认为Lixotheca归入膜蕨科的理由是较为充分的.而Szea则应被归入里白科.As a more comprehensive form genus, Cladophlebis is used mainly for the sterile fronds prevailed in the Mesozoic flora, though this group of plants made their first appearance in the Permian period as forerunners. It is well worth notice that up to date 20 species of the genus have been described in the Gigantopteris Flora in China, i.e., Cladophlebis nystroemii Halle, 1927; Cl.? yongwolensis (Kaw., 1927) Stockm. et Math., 1939; Cl. manchurica (Kaw., 1927) Gu et Zhi, 1974; Cl. ozakii Yabe et Oishi, 1938; Cl. permica Lee et Wang, 1956; Cl. connexa J. H. Zhang, 1978; Cl. alata Yang et Chen, 1979; Cl. (Oligocarpia?) crenata Yang et Chen, 1979; Cl. rhomboidea-ovata Yang et Chen, 1979; Cl. henanensis Zhang et Mo, 1979; Cl. fuyuanensis Zhang, 1980; Cl. parapermica Zhang, 1980; Cl. yunnanica Zhang, 1980; Cl. paraozakii Li, Yao et Deng 1982; Cl. fissilis Zhu, Hu et Z. J. Li, 1984; Cl. liulinensis Xiao, 1985; Cl. deltata Yang, 1987; Szea (Cladophlebis) sinensis Yao et Taylor, 1988; Cladophlubis? lanceolata Si, 1989 and Chansitheca (Cladophlebis) anxiensis S. S. Li, 1989. shaped, sheathing the basal part of the elongated receptacle. Sporangia numerous in each sorus, most probably rounded, arranged quincuncially; annulus complete, oblique or transverse. Type-species Lixotheca (Cladophlebis) permica (Lee et Wang) comb. nov. Etymology 'Lix', abbreviated from Li Xing-xue, and 'theca', Greek, in honor of Prof. Li Xing-xue, who first described the sterile frond of the type species with Mr. Wang Shui. Occurrence Permian; China. Lixotheca (Cladophlebis) permica (Lee et Wang) comb. nov. (Pl. Ⅰ-Ⅲ; Text-figs. 1,2) Sterile frond large, at least bipinnate. Shape of penultimate pinnae (Pl. I, fig. 2) unknown, with preserved part measuring about 18cm in breadth and 11cm in length. Pinna rachis 2.5-3.5mm broad, finely striated. Ultimate pinnae linear, with acuminate apices, alternate, forming an angle of 50°-70° with the rachis, crowded, at least 11cm long and about 2cm broad in the mi

关 键 词：二叠纪 枝脉蕨属 新属 李氏蕨属 

分 类 号：Q914.85[天文地球—古生物学与地层学]