AGLAOPHYTON-MAJOR, A NONVASCULAR LAND-PLANT FROM THE DEVONIAN RHYNIE CHERT
AGLAOPHYTON-MAJOR, A NONVASCULAR LAND-PLANT FROM THE DEVONIAN RHYNIE CHERT
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DOI：
10.1111/j.1095-8339.1986.tb01020.x
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发表时间：
1986-09-01
影响因子：
2.4
通讯作者：
EDWARDS, DS
中科院分区：
文献类型：
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作者：
EDWARDS, DS
该属Aglaophyton被描述为容纳植物以前被称为Rhynia major，重新审查使用新的材料和技术。这株植物是孢子体，被认为比原先设想的要短，并且已经形成了广泛的外倾轴。这些功能，与二叉分支的角度和孢子囊的频率的信息，被纳入一个新的重建的植物。轴内的导电股线由三个区域组成，薄壁单元的中心区域、厚壁单元的中间区域和薄壁单元的外部区域。没有迹象表明，在这些区域的任何细胞壁增厚的差异和链被解释在braritic传导链，内部两个区域相媲美的水螅和外部区域相媲美的leptoids中发现的polytrichaceous苔藓配子体和孢子体。因此，该植物表现出介于维管植物和某些苔藓植物之间的特征，不能被认为是任何一个组的成员;目前，它没有被分配到一个更高的类别。根据已发表的结果和新数据，还包括Rhynia gwynne-vaughanii的重新诊断。
The genus Aglaophyton is described to accommodate the plant formerly known as Rhynia major, re-examined using new material and techniques. The plant, which is a sporophyte, is suggested to have been shorter than originally supposed and to have formed extensive stands of decumbent axes. These features, with information on the angle of dichotomous branching and the frequency of sporangia, are incorporated into a new reconstruction of the plant. The conducting strand within the axes consists of three zones, a central region of thin-walled cells, a middle region of thick-walled cells and an outer region of thin-walled cells. There is no indication of differential wall thickenings in the cells of any of these zones and the strand is interpreted in terms of a bryophytic conducting strand, the inner two regions being comparable to hydroids and the outer region comparable to the leptoids found in polytrichaceous moss gametophytes and sporophytes. The plant thus exhibits characters intermediate between tracheophytes and some mosses and cannot be considered a member of either group; at the present time it is not assigned to a higher category. A rediagnosis of Rhynia gwynne-vaughanii, based on published results and new data, is also included.