A reconsideration of cf. Psilophyton princeps (Croft & Lang, 1942), a zosterophyll widespread in the Lower Old Red Sandstone of South Wales
A reconsideration of cf. Psilophyton princeps (Croft & Lang, 1942), a zosterophyll widespread in the Lower Old Red Sandstone of South Wales
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重新考虑参见。
DOI：
10.1111/j.1095-8339.1989.tb01723.x
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发表时间：
1989
期刊：
影响因子：
--
通讯作者：
L. Carluccio
中科院分区：
文献类型：
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作者：
D. Edwards;P. Kenrick;L. Carluccio
见Wards，D.，Kenrick，P.&CarLuccio，L.M.，1988。重新思考cf.P lophyton princeps(Croft&Lang，1942)，广泛分布于南威尔士老1砂岩下部的一种浮游动物。来自格温特兰诺弗采石场的下泥盆纪植物，被称为cf。Psilophyton princeps，被证明是一种浮游植物，被归入一个新属。它包括一个平面的假单轴和等距分枝系统，该系统具有腋下前缘(腋下小结)和环状尖端，有时被向下定向的螺旋状分支轴所取代。木质部横切面和外表面呈带状，由直接相连和非直接相连的环状加厚物组成。延伸的远端可育带由轴线组成，轴线上有两排相对或近相对的斑点。每个孢子囊由两个相等的裂片组成，从正面看是椭圆形到肾形，直立在一个短的弯曲的柄上。凸缘周围有裂口，边缘有一条狭窄的增厚带。威尔士植物与其他动物性叶植物相比较，看起来最接近于索尔纳塔，除了它们有腋下分枝和缺乏特有的深色尖刺。对煤化物质的详细分析：以及黄铁矿在包矿化中的分布和组构表明，管胞的原始结构与Gosslingia和大多数其他带状叶植物相似，攻丝过程也大致相同，木质化的壁以胶结层的形式保存，较软的组织被黄铁矿取代。黄铁矿和褐铁矿中的透矿化作用可以评估黄铁矿氧化对原始细胞结构的影响。
EE WARDS, D., KENRICK, P. & CARLUCCIO, L. M., 1988. A reconsideration of cf. P lophyton princeps (Croft & Lang, 1942), a zosterophyll widespread in the Lower Old Rt 1 Sandstone of South Wales. The Lower Devonian plant from Llanover Quarry, Gwent, cal ed cf. Psilophyton princeps, is shown to be a zosterophyll and placed in a new genus. It comprises an ere t planar pseudomonopodial and isotomously branching system of spiny axes with subaxillary pre ections (axillary tubercles) with circinate tips, sometimes replaced by a downwardly directed, spiring, branching axis. Its xylem, strap-shaped in cross-section and exarch, is composed of directly and ndirectly connected annular thickenings. An extended distal fertile zone consists of axes with spot ingia in two opposite or sub-opposite rows. Each sporangium comprises two equal valves, ellip'ical to reniform in face view, and is held upright on a short curved stalk. Dehiscence is around the convex margin which is bordered by a narrow strip of thickening. The Welsh plants are comp ired with other zosterophylls and appear closest to Sawdonia ornata except that they possess sub-axillay branches and lack the characteristic dark-tipped spines. Detailed analysis of coalified mater: and the distribution and fabric of pyrite in permineralizations shows that the original structure of the tracheids was similar to that in Gosslingia and most other zosterophylls, and that the taphonomic processes, with lignified walls preserved as coalified layers and softer tissues replaced by pyrite, were also broadly the same. Permineralizations in pyrite and limonite allow an evaluation of the effects of oxidation of pyrite on original cell structure.