A 298-million-year-old gleicheniaceous fern from China
A 298-million-year-old gleicheniaceous fern from China
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来自中国的一种拥有 2.98 亿年历史的蕨类植物
DOI：
10.1016/j.revpalbo.2020.104355
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发表时间：
2021-09-28
影响因子：
1.9
通讯作者：
Wang, Jun
中科院分区：
文献类型：
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作者：
He, Xuezhi;Zhou, Weiming;Wang, Jun
晚古生代的ChansithecaRege属、OligocatpiaGiippert属和SzeaZ. Yao et T. N.泰勒是小型蕨类植物，根据其形态和可育器官的解剖，代表了Glcicheniaccac的推定早期成员。然而，轴和茎的解剖是未知的，使他们的系统亲和力有争议。在这里，我们记录了部分保存的解剖结构与压缩/印象标本的Chansitheca乌达凝灰岩植物群的轴。该植物群的原位保存、偶然的有机联系和密切的关联以及匹配的大小、比例和木质部结构表明，这些穗轴属于同一植物，该植物产生了乌达长柄草类型的可育叶和在该植物群中共存的楔蕨类型的营养叶。植物群。新的解剖学和形态学的细节需要校正本种的诊断。由于乌达凝灰岩植物群的年代为298.34 +/- 0.09百万年前（二迭纪的阿塞尔期），这代表了格列雪宁科最古老的明确证据。因此，我们的研究结果表明，Gleicheniaceae已经从其他蕨类植物的家庭，包括Osmundaceae，这个时候。(C)2020爱思唯尔B. V.保留所有权利。
The late Paleozoic genera Chansitheca Rege, Oligocatpia Giippert and Szea Z. Yao et T. N. Taylor arc small ferns that represent putative early members of the Glcicheniaccac based on their morphology and the anatomy of their fertile organs. However, the rachis and cauline anatomy are unknown, rendering their systematic affinities controversial. Here we document rachides with partly preserved anatomical structure associated with compression/impression specimens of Chansitheca wudaensis from the Wuda Tuff Flora. The in situ preservation of the flora, occasional organic connection and close association, and matching size, proportions and xylem structure indicate that these rachides belonged to the same plant that produced fertile fronds of the Chansitheca wudaensis type and vegetative fronds of the Sphenopteris type co-occurring in this flora. The new details of the anatomy and morphology necessitate emendations to the diagnosis for this species. As the Wuda Tuff Flora has been dated to be 298.34 +/- 0.09 million years ago (Asselian, Permian), this represents the oldest unequivocal evidence of Gleicheniaceae. Our results thus demonstrate that the Gleicheniaceae had already diverged from other ferns families, including the Osmundaceae, by this time. (C) 2020 Elsevier B.V. All rights reserved.