摘要
本文报道了滇东南文山地区下泥盆统坡松冲组(西根阶)地层中一陆生植物新属、种——纤细始叶蕨(Eophyllophyton bellum gen.et sp.nov)。植物体矮小,多次二叉分枝,远端枝二列互生长出次一级二叉分枝为主的末级枝;枝系起源叶顶生或侧生,多次分叉,缩合,扁化、蹼化并部分并合;生殖单位可下垂,由二枚顶端内卷的孢子叶组成;孢子囊圆至肾形,沿远端加厚带开裂,成列侧生在孢子叶相对面的叶轴上。上述特征表明新植物远比同期的莱尼蕨类、三枝蕨类和工蕨类复杂和进化,并显示出和工蕨类的某些亲缘关系。文内还探讨了枝系起源叶(大型叶)的发生和演化。
A new genus and species,Eophyllophyton bellum,is described from the Posongchong Formation (Siegenian) of the Lower Devonian in Wenshan district,Yunnan,China.This plant bears lateral branching laminate structures interpreted as leaves,which are believed to derive from lateral axial branching systems In addition similarly organised sporophylls are considered homologous to these leaves.In the possession of these vegetative leaves and spo- rophylls Eophyllophyton,is significantly more advanced than any other Siegenian taxon.
基金
国家自然科学基金
地质行业科学技术发展基金联合资助课题
