辽宁抚顺始新统黑三棱属一新种  

A new species of Sparganium from the Eocene of Fushun, Liaoning Province

作　　者：耿宝印[1] 

机构地区：[1]中国科学院植物研究所

出　　处：《植物分类学报》1999年第2期204-208,共5页Acta Phytotaxonomica Sinica

基　　金：国家自然科学基金;中国科学院生物科学技术研究特别支持费

摘　　要：本文描述了辽宁抚顺始新统黑三棱属的一个种———抚顺黑三棱Ｓｐａｒｇａｎｉｕｍｆｕｓｈｕｎｅｎｓｅ，化石标本仅保存果枝部分。根据新标本头状聚花果显示的形态与结构特征，对该属的现生种和化石种做了详细的比较。Sparganium fushunense Geng is described as new from the Jijuntun Formation(Middle to Late Eocene) of Fushun region in Liaoning Province, China. The preserved fertile branches bear fruiting heads. A morphological comparison of the fruit heads is made between the specimens studied here with those of the living species and other fossil species. The results show that the new species is distinguishable mainly by the shape of the tepals and the size of the fruits. Sparganium fushunense Geng, sp. nov. Head bearing axis at least 14.5 cm long, about 1.0 mm wide, with longitudinal striae more or less parallel on its surface. Axes with 4～6 lateral fruit heads, interval between heads 0.5～2.0 cm. Fruiting head sessile, globose, about 5 mm in diameter, made up of tightly packed tepals and fruits radiating from a small receptacle. Tepals narrowly obovate, apically rounded, about 1.8 mm long, 0.2～0.7 mm wide. Fruits elliptic, sessile, with smooth surface, 1.16～1.25 mm long, at apex with a beak 1.5～2.0 mm long. Seed elliptic, long axis 0.48～0.75 mm long, short axis 0.23～0.45 mm long. Seed coat cells irregularly polygonal , 4.1～19 μm in diameter, with smaller ones in both the apical and basal parts,the larger ones in the middle part and a papillate process at the apex.

关 键 词：抚顺 始新统 黑三棱属 抚顺黑三棱 

分 类 号：Q914.8[天文地球—古生物学与地层学]