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

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。

FIRST DISCOVERY OF CYCLOSTIGMA-LIKE STEM WITH LIGULAR PIT FROM UPPER DEVONIAN OF CHAOHU CITY, ANHUI

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.