具叶舌痕的圆印木状茎干在安徽巢湖上泥盆统的首次发现
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摘要
在描述的几块产自安徽巢湖五通组中上部(法门期)的圆印木状茎干中,首次发现其中一块标本具有明显的叶舌痕,它与另一块叶痕特征相同但不具叶舌痕的标本共生.说明它们很可能应归为同一种植物。因此叶舌痕的有无很可能与化石的保存状态有关。圆印木属与窝木属仅根据茎干叶痕特征是难于区分的。但由于这两个属的生殖部分(球果)存在差别,目前仍被视为不同的属。当前的标本未发现生殖部分,难于确定其归属。笔者建议,为了实用方便将这类发现于上泥盆统的标本,暂归为Bothrodendron(Cyclostigma)属名之下,作为形态属或卫星属来处理。
        A few Cyclostigma --like stem impressions, originally identified as Cyclostigmakiltorkense Haughton under study, were collected from the middle upper part of the Wutung Formation at the Shizikou Section, Chaohu City, Anhui (Text--fig. l). They occur inassociation with the Upper Devonian megafossil plants, such as Archaeopteris sp..Hamatophyton verticillatum Gu et Zhi, Sphenophyllum lungtanense Gothan and Sze,Sublepidodendron mirabile (Nathorst ) Hirmer, Sublep. wusihense (Sze ) Sze,Lepidodendropsis of. scobiniformis (Meek ) Read, Lepidostrobus grabaui Sze andStigmaria radiata--punctata Gothan and Sze, and the Strunian spore assemblage, such asRetispora lepidophyta (Kedo) Play ford, indicating that the plant--bearing bed should bedefinitely assigned to the late Late Devonian (Famennian) in age.
引文
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