A new plant, Zhenglia radiata gen. et sp. nov., from the Posongchong Formation （Early Devonian, Pragian age） of the Wenshan District of southeastern Yunnan Province, China is a small herbaceous lycopsid. The aerial ...A new plant, Zhenglia radiata gen. et sp. nov., from the Posongchong Formation （Early Devonian, Pragian age） of the Wenshan District of southeastern Yunnan Province, China is a small herbaceous lycopsid. The aerial branches divide into foliar and fertile stems. The arrangement of the leaf bases on the stem shows lepidodendroid-like phyllotaxy. Possibly the leaf base bears a ligulate pit. The microphyll consists of a swollen, decurrent base, and an entire, linear lamina. The fertile axis is composed of sporophylls arranged helically, forming a compact area similar to cone-like structure. Each sporophyll consists of a widened lateral extension and a distal lamina. The ovoid-elongate sporangia are attached adaxially on the surface of sporophylls. Based on morphological similarities, especially the undivided microphylls, the style of phyllotaxy, the form of the cone-like structures and sporangia, the new lycopsid Zhenglia radiata is placed in the order Protolepidodendrales and a possible evolutionary relationship with the arborescent lycopsids of the Late Devonian and Carboniferous is considered.展开更多
本文报道了滇东南文山地区下泥盆统坡松冲组(西根阶)地层中一陆生植物新属、种——纤细始叶蕨(Eophyllophyton bellum gen.et sp.nov)。植物体矮小,多次二叉分枝,远端枝二列互生长出次一级二叉分枝为主的末级枝;枝系起源叶顶生或侧生,...本文报道了滇东南文山地区下泥盆统坡松冲组(西根阶)地层中一陆生植物新属、种——纤细始叶蕨(Eophyllophyton bellum gen.et sp.nov)。植物体矮小,多次二叉分枝,远端枝二列互生长出次一级二叉分枝为主的末级枝;枝系起源叶顶生或侧生,多次分叉,缩合,扁化、蹼化并部分并合;生殖单位可下垂,由二枚顶端内卷的孢子叶组成;孢子囊圆至肾形,沿远端加厚带开裂,成列侧生在孢子叶相对面的叶轴上。上述特征表明新植物远比同期的莱尼蕨类、三枝蕨类和工蕨类复杂和进化,并显示出和工蕨类的某些亲缘关系。文内还探讨了枝系起源叶(大型叶)的发生和演化。展开更多
New materials from the Upper Devonian （Famennian） Wutong Formation of Chizhou District, Anhui Province, South China, allow description of fertile and sterile characters of Archaeopteris halliana. This plant has penu...New materials from the Upper Devonian （Famennian） Wutong Formation of Chizhou District, Anhui Province, South China, allow description of fertile and sterile characters of Archaeopteris halliana. This plant has penultimate axes attached by sterile leaves and paired ultimate branches in the same ontogenetic spiral. Sterile leaves are narrowly cuneate in shape and bear distal margins dissected deeply. These leaves are spirally arranged on sterile ultimate axes. Non-laminated sporophylls occur spirally on the ultimate axes and bifurcate once or twice. Elongate sporangia with longitudinal dehiscence are borne adaxially below or above the dividing points of the sporophylls. Despite the leaf shape resembling that of Archaeopteris macilenta, our plant is assigned to A. halliana because of its non-laminated sporophylls. Fertile characters should be given priority or enough consideration in identifying species of Archaeopteris.展开更多
Adoketophyton subverticillatum(Li et Cai)Li et Edwards(亚轮生奇异蕨)是云南早泥盆世坡松冲植物群中颇具代表性的、研究较为详细的一种植物,目前对其整体形态特征和解剖结构都有较深入的认识。本文通过系列针修法,将采自贵州都匀包...Adoketophyton subverticillatum(Li et Cai)Li et Edwards(亚轮生奇异蕨)是云南早泥盆世坡松冲植物群中颇具代表性的、研究较为详细的一种植物,目前对其整体形态特征和解剖结构都有较深入的认识。本文通过系列针修法,将采自贵州都匀包阳剖面蟒山群下段的一块植物化石新材料归入A.subverticillatum。基于目前对Adoketophyton时空分布的认识,认为该属可作为早泥盆世植物群的代表分子,并据此推断蟒山群下段的时代应为早泥盆世。Adoketophyton subverticillatum在都匀的发现,表明贵州都匀蟒山群中的植物与云南坡松冲植物群在属、种一级上存在扩散与交流现象。Adoketophyton及其他相关植物的研究表明,在高大气CO浓度的早泥盆世,叶性结构如孢子叶、苞片、枝叶复合体等已广泛分布于华南板块。展开更多
基金This work was supported by the National Natural Science Foundation of China （No. 40232019 No. 40302001）.
文摘A new plant, Zhenglia radiata gen. et sp. nov., from the Posongchong Formation （Early Devonian, Pragian age） of the Wenshan District of southeastern Yunnan Province, China is a small herbaceous lycopsid. The aerial branches divide into foliar and fertile stems. The arrangement of the leaf bases on the stem shows lepidodendroid-like phyllotaxy. Possibly the leaf base bears a ligulate pit. The microphyll consists of a swollen, decurrent base, and an entire, linear lamina. The fertile axis is composed of sporophylls arranged helically, forming a compact area similar to cone-like structure. Each sporophyll consists of a widened lateral extension and a distal lamina. The ovoid-elongate sporangia are attached adaxially on the surface of sporophylls. Based on morphological similarities, especially the undivided microphylls, the style of phyllotaxy, the form of the cone-like structures and sporangia, the new lycopsid Zhenglia radiata is placed in the order Protolepidodendrales and a possible evolutionary relationship with the arborescent lycopsids of the Late Devonian and Carboniferous is considered.
文摘本文报道了滇东南文山地区下泥盆统坡松冲组(西根阶)地层中一陆生植物新属、种——纤细始叶蕨(Eophyllophyton bellum gen.et sp.nov)。植物体矮小,多次二叉分枝,远端枝二列互生长出次一级二叉分枝为主的末级枝;枝系起源叶顶生或侧生,多次分叉,缩合,扁化、蹼化并部分并合;生殖单位可下垂,由二枚顶端内卷的孢子叶组成;孢子囊圆至肾形,沿远端加厚带开裂,成列侧生在孢子叶相对面的叶轴上。上述特征表明新植物远比同期的莱尼蕨类、三枝蕨类和工蕨类复杂和进化,并显示出和工蕨类的某些亲缘关系。文内还探讨了枝系起源叶(大型叶)的发生和演化。
基金supported by the National Natural ScienceFoundation of China(Nos.40772010,40830211)the Foundation for the Author of National Excellent Doctoral Dissertation of China(200429)
文摘New materials from the Upper Devonian （Famennian） Wutong Formation of Chizhou District, Anhui Province, South China, allow description of fertile and sterile characters of Archaeopteris halliana. This plant has penultimate axes attached by sterile leaves and paired ultimate branches in the same ontogenetic spiral. Sterile leaves are narrowly cuneate in shape and bear distal margins dissected deeply. These leaves are spirally arranged on sterile ultimate axes. Non-laminated sporophylls occur spirally on the ultimate axes and bifurcate once or twice. Elongate sporangia with longitudinal dehiscence are borne adaxially below or above the dividing points of the sporophylls. Despite the leaf shape resembling that of Archaeopteris macilenta, our plant is assigned to A. halliana because of its non-laminated sporophylls. Fertile characters should be given priority or enough consideration in identifying species of Archaeopteris.
文摘Adoketophyton subverticillatum(Li et Cai)Li et Edwards(亚轮生奇异蕨)是云南早泥盆世坡松冲植物群中颇具代表性的、研究较为详细的一种植物,目前对其整体形态特征和解剖结构都有较深入的认识。本文通过系列针修法,将采自贵州都匀包阳剖面蟒山群下段的一块植物化石新材料归入A.subverticillatum。基于目前对Adoketophyton时空分布的认识,认为该属可作为早泥盆世植物群的代表分子,并据此推断蟒山群下段的时代应为早泥盆世。Adoketophyton subverticillatum在都匀的发现,表明贵州都匀蟒山群中的植物与云南坡松冲植物群在属、种一级上存在扩散与交流现象。Adoketophyton及其他相关植物的研究表明,在高大气CO浓度的早泥盆世,叶性结构如孢子叶、苞片、枝叶复合体等已广泛分布于华南板块。
