早白垩世Ruffordia goepperti的原位孢子及与分散孢子的关系

Relationship Between the Early Cretaceous Ruffordia goepperti and Dispersed Spores Cicatricosisporites

海金沙科的Ruffordia goepperti(Dunker)Seward是世界上早白垩世极为重要的蕨类植物。通过对比发现,Ruffordia goepperti原位孢子的形态和细微纹饰与地层中分散孢子Cica-tricosisporites australiensis(Cookson)Potonie和C.minor(Bolch.)Pocock一致,而且大化石与分散孢子的地史、地理分布范围也相同,因而认为R.goepperti是C.australiensis和C.minor的母体植物,后者为幼体孢子。本文还讨论了这一发现的意义及Cicatricosisporites dorogensis的鉴定问题。

Comparison of the in situ spores of the Early Cretaceous Schizaeaceous fern Ruffordia goep-perti (Dunk. ) Seward with the dispersed spores from the Lower Cretaceous indicates that the spores of R. goepperti are identical to Cicatricosisparties australiensis (Cookson) Potonie and C. minor (Bolch. ) Pocock both in the outlines and ornamentation. Besides, the megafossils and the dispersed spores have the similar stratigraphic and geographic distributions. Therefore, Ruffordia goepperti is the parent plant of Cicatricosisporites australiensis and C. minor and the latter one represents the unripe spores. The stratigraphic and paleoecologic significance of this relationship is discussed.