IX.—On the Fossil Osmundaceæ
IX.—On the Fossil Osmundaceæ
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DOI：
10.1017/s0080456800002738
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通讯作者：
R. Kidston;D. T. Gwynne-Vaughan
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作者：
R. Kidston;D. T. Gwynne-Vaughan
本文的第一部分还在准备中，我们在各种古植物学出版物中进行了搜索，希望能找到迄今为止一直没有得到承认的紫萁科化石的记录。在这样做的时候，我们的注意力立刻被艾希瓦尔德在他的《Lethæa Rossica》中对一些非常好的化石的描述和数字所吸引，他认为这些化石代表了乔木蕨类植物的茎。我们特别感兴趣的是Chelepteris gracilis，Eichwald，Sphallopteris Schlechtendalii，Eichwald，Chalypteris rhomboidea，Eichwald，sp.，和Anomorrhæa Fischeri，Eichwald。这些植物的图形和描述对于确定它们真正的亲缘关系是相当不充分的;但是必须记住，在艾希瓦尔德写这些描述的时候，许多现在被认为在确定亲缘关系方面至关重要的结构特征甚至没有被植物学家承认。为了使我们能够在可能的情况下解决这些困难，我们写信给蒙斯。圣彼得堡地质委员会的地质学家米歇尔·扎列斯基询问是否已知存在这些标本的类型，以及是否已经从它们中制备出适合显微镜检查的任何制剂。
While the first part of this paper was in course of preparation a search was made through various palæobotanical publications in the hope of meeting with records of Osmundaceous fossils that had hitherto escaped recognition as such. In so doing our attention was at once attracted by the descriptions and figures given by Eichwald in his Lethæa Rossica of some very fine fossils which were held by him to represent the stems of arborescent ferns. Those in which we were particularly interested were Chelepteris gracilis, Eichwald, Sphallopteris Schlechtendalii, Eichwald, Bathypteris rhomboidea, Eichwald, sp., and Anomorrhæa Fischeri, Eichwald. The figures and descriptions of these plants were quite inadequate for the determination of their true affinities; but it must be remembered that at the time when these descriptions were written by Eichwald many structural characters which are now regarded as of paramount importance in determining affinities were not recognised as such, even by botanists. To enable us if possible to clear up these difficulties, we wrote to Mons. Michel Zalessky, geologist on the staff of the Comité géologique, St Petersburg, asking if the types of these specimens were known to be in existence, and if any preparations had been made from them suitable for microscopical examination.