植物分类学报

• 研究论文 • 上一篇    

辽宁抚顺始新统黑三棱属一新种

耿宝印   

  • 收稿日期:1900-01-01 修回日期:1900-01-01 出版日期:1999-03-10 发布日期:1999-03-10
  • 通讯作者: 耿宝印

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

GENG Bao-Yin   

  • Received:1900-01-01 Revised:1900-01-01 Online:1999-03-10 Published:1999-03-10
  • Contact: GENG Bao-Yin

Abstract: Sparganium fushunense Geng is described as new from the Jijuntun Formation (Middle to Late Eocene) of Fushun region in Liaoning Province, China. The preserved fer- tile branches bear fruiting heads. A morphological comparison of the fruit heads is made be- tween 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 ellip- tic, long axis 0.48~0.75 mm long, short axis 0.23~0.45 mm long. Seed coat cells irregu- larly polygonal , 4.1~19 vn in diameter, with smaller ones in both the apical and basalparts,the larger ones in the middle part and a papillate process at the apex.

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