VIII. On the Structure and Affinities of Stephanospermum, Brongniart, a Genus of Fossil Gymnosperm Seeds.
VIII. On the Structure and Affinities of Stephanospermum, Brongniart, a Genus of Fossil Gymnosperm Seeds.
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DOI：
10.1111/j.1095-8339.1904.tb00278.x
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发表时间：
1904-03
期刊：
影响因子：
--
通讯作者：
F. W. Oliver
中科院分区：
文献类型：
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作者：
F. W. Oliver
最后的许多数控;表贡献化石植物学由阿道夫布朗，&艺术是一个大系列的硅化种子的形态学的一般帐户大克鲁瓦的鹅卵石，附近的圣埃蒂尤恩。最初出版于1874年 *，这份文稿在他去世几年后作为纪念卷于1881年重新发行，并附有许多精美的盘子。关于具有苏铁组织的种子，布朗尼亚列举了17个属，这个数目后来有所增加。在布朗尼亚尔时代以后的岁月里，他的追随者，特别是雷诺，对这些形式中的许多形式进行了更详细的阐述，在极少数情况下，有可能提出足够的证据，将一定数量的形式与它们所属的植物联系起来。直到今天，在晚古生代岩石中发现的大部分法国种子，以及来自英国煤系的数量较少的形式，都被称为分离结构，它们的真实的亲缘关系是一种猜测。尽管有这样的局限性，即我们只知道这些种子是分离的结构，但种子是植物的重要组成部分，因此，对化石种子组织的详细了解，在揭示近代植物复杂的系统发育史方面，一定会是一个有用的辅助手段。它与其中一种化石--Xte ~ hccnos~ e~ m~~-tliat Brongniart有关
THE last of many nc; table contributions to Fossil Botany by Adolphe Bron, &art was a general account of the morphology of a large series of silicified seeds from the pebbles of Grand'Croix, near St. Etieune. Originally published in 1874*, this contribution was re-issued in 1881 with numerous beautiful plates some years after his death as a memorial volume?. Of seeds having what may be termed a Cycadean organisation, Brongniart enumerates seventeen genera, a number which has been increased since. In the years that have elapsed since Brongniart's time many of these forms have been elaborated in greater detail by his followers, especially Renault, and in rare instances it has been possible to produce adequate evidence for referring a certain number to the plants to which they belonged. To this day the great bulk of the French seeds found in the later Palzozoic rocks, as also t'he less numerous forms from the English Coal-Measures, are known as detached structures, and their real affinity is a matter of conjecture. Notwithstanding this limitation, that we know these seeds only as detached structures, so important a portion of the plant is the seed that a detailed knowledge of the organisation of fossil seeds cannot fail to be a useful adjunct in unravelling the intricate phylogenetic history of recent plants. It mas in connection with one of these fossils-Xte~ hccnos~ e~ m~~-tliat Brongniart