云南西冲组的一种细小植物——兼论华南中泥盆世晚期植物组合(英文)  

A NEW SMALL PLANT FROM THE XICHONG FORMATION OF YUNNAN, AND DISCUSSION ON THE FLORAL ASSEMBLAGE OF LATE MIDDLE DEVONIAN IN SOUTH CHINA

作　　者：王怿[1] Christopher M. Berry 

机构地区：[1]中国科学院南京地质古生物研究所,南京210008 [2]英国卡的夫大学地质系

出　　处：《古生物学报》2001年第4期424-432,共9页Acta Palaeontologica Sinica

基　　金：国家重点基础研究发展规划项目 (No .G2 0 0 0 0 7770 0 );国家自然科学基金项目 (No .49972 0 0 8)资助

摘　　要：研究我国云南中泥盆世晚期西冲组的一种细小植物Psilophytonstriatumsp .nov .,它具有二歧分叉光滑轴和生殖枝 ,生殖枝由三次等二歧分叉枝系和族生孢子囊组成。枝系末端着生两对直立孢子囊。根据对已有材料的分析 ,宜将华南中泥盆世晚期植物组合改名为Lepidodendropsisarborescense Minarodendroncathaysiense Eocladoxylonminutum (LME)组合。它以石松类植物为主 ,共生有“真蕨植物”和三枝蕨类 ,分为小形树状植物和地面植物两个生态系统。同时 。A new small plant, collected from Xichong Formation of Qujing, Yunnan, China, is named Psilophyton striatum sp. nov. This plant is characterized by smooth dichotomous axes, a fertile unit with a three times isotomously supporting system and clustered sporangia recurved towards the axis, and two pairs of erect sporangia on each terminal segment with no torsion. The floral assemblage of the late Middle Devonian in South China is provisionally renamed the Lepidodendropsis arborescense-Minarodendron cathaysiense-Eocladoxylon minutum Assemblage. This floral assemblage is dominated by lycopsida, together with “ferns” and trimerophytes, and divided into two ecological levels: the small tree and ground cover level. Comparison with coeval floras in the world is discussed.

关 键 词：Psilophyton 中泥盆世晚期 植物组合 华南 云南西冲组 细小植物 

分 类 号：Q914[天文地球—古生物学与地层学]