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A New zosterophyll Plant,Ramoferis ***.,from the Posongchong Formation of Lower Devonian (Pragian) of Southeastern Yunnan,China

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Acta Geologica Sinica(English Edition) 2011年第4期85卷 765-776页

作者： HAO Shougang XUE Jinzhuang Key Laboratory of Orogenic Belts and Crustal Evolution School of Earth and Space SciencesPeking UniversityBeijing 100871China

A new genus and species,Ramoferis amalia *** ***.,is described from the Early Devonian（Pragian）Posongchong Formation,Wenshan district of southeastern Yunnan,*** plant has isodichotomous major axes,which also divide anisotomously distally to produce closely spaced lateral branches,often within fertile *** stalked round to reniform sporangia,borne laterally and spirally over several levels of branches,are distantly to moderately spaced or aggregated into distinct *** stalks increase in width from the base to the sporangial junction resulting in a gradual transition between sporangium and *** with known zosterophylls shows that this plant is most similar to the genera zosterophyllum and Wenshania,differing in the character combinations of sporangial shape,sporangium/stalk junction,stalk dimensions and orientation,and especially in both sterile and fertile branchlets being borne within the fertile *** addition,the observation and comparison indicate distinct variety in structure of sporangial border and suggest that the two-layered sporangium wall characterized by outer anticlinal layer and inner periclinal layer might represent potential synapomorphies,while the different dehiscence mechanism is an autapomorphy for each taxon in zosterophylls.

关键词： zosterophyll Early Devonian Posongchong Flora Yunnan

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Two zosterophyll Plants from the Lower Devonian(Lochkovian)Xitun Formation of Northeastern Yunnan,China

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Acta Geologica Sinica(English Edition) 2009年第3期83卷 504-512页

作者： XUE Jinzhuang The Key Laboratory of Orogenic Belts and Crustal Evolution School of Earth and Space Sciences Peking University Beijing 100871 China

Two zosterophyll plants are described from the Lower Devonian （Lochkovian） Xitun Formation of Qujing, Yunnan, China. Xitunia spinitheca gen. et sp. nov. has stalked sporangia laterally attached on the axis in a helical arrangement. Sporangia are dorsoventrally flattened and composed of two unequal valves; the adaxial valve is round in face view, while the abaxial valve is larger than the former, triangular or wedge-shaped, and radially bears long spiny appendages along the distal margin. Xitunia shows new variation of sporangial morphology within the zosterophylls. zosterophyllum minorstachyum sp. nov. has K-shaped branchings at the basal parts and small-sized terminal spikes, which consist of round to elliptical sporangia arranged helically. This paper provides new data on the diversity of plant types during Lochkovian when rare vascular plants were reported. As for various species of zosterophyllum in South China, their apparent evolutionary trend of features from the Late Silurian to Early Devonian （Emsian） is discussed.

关键词： Early Devonian Lochkovian Xitunia gen. nov. zosterophyll ZosterophyUum

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