The earliest vascular land plants: continuing the search for proof
The earliest vascular land plants: continuing the search for proof
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DOI：
10.1111/j.1502-3931.1979.tb01017.x
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发表时间：
1979-10
期刊：
影响因子：
1.5
通讯作者：
D. Edwards;MICHAEL G. Bassett;E. Rogerson
中科院分区：
文献类型：
--
作者：
D. Edwards;MICHAEL G. Bassett;E. Rogerson
在威尔士的Bringewoodian地层（志留纪，卢德洛系列，Saetograptus leintwardinensis incipiens带）中的新标本产生了已知最古老的植物Cooksonia的标本。从证据在年轻（Ezziness;eoli/唐顿）地平线本属被认为是一个维管植物;虽然没有管胞已被分离出的Bringewoodian标本，比较形态的基础上，他们得出的结论是最古老的记录维管植物。简要回顾了与维管植物鉴定有关的证据类型，并讨论了威尔士库克索尼亚植物群植物群与其他晚志留世植物群的关系。有信心的地层定年是任何讨论早期植物进化的先决条件，强调一个综合的方法，包括地质和古植物学调查的可取性。志留纪不同植物群（包括石足类）的两个已发表记录的年代测定受到质疑;最近根据笔石对澳大利亚Baragwanathia植物群的年代测定早于卢德洛，但没有贝壳动物群证据的支持，这表明下泥盆统内部存在相关性。
New collections from Bringewoodian strata (Silurian, Ludlow Series, Saetograptus leintwardinensis incipiens Zone) in Wales have yielded the oldest known specimens of the plant Cooksonia. From evidence at younger (Eř;eoli/Downton) horizons this genus is considered to be a vascular plant; although no tracheids have been isolated from the Bringewoodian specimens, on the basis of comparative morphology they are concluded to be the oldest recorded tracheophytes. The types of evidence relevant to the identification of vascular plants are briefly reviewed, and the relationships of the Welsh Cooksonia flora to other late Silurian floras are discussed. Confident stratigraphical dating is a prerequisite for any discussion of early plant evolution, emphasising the desirability of an integrated approach incorporating both geologial and palaeobotanical investigations. The dating of two published records of diverse Silurian floras, including lycopods, is questioned; recent dating of the Australian Baragwanathia flora as early Ludlow on the basis of graptolites is not supported by the shelly faunal evidence, which indicates a correlation within the Lower Devonian.