SYNTHETIC STUDY ON THE ORIGIN OF CIRCUM-ANTARCTIC DISTRIBUTION

每个或一组调查人员在下列国家进行了实地收集。根据收集的材料得出的结果将发表在科学期刊上。Nishida和Asakawa在最近出版的两本流行书籍中报道了与冈瓦那大陆有关的实地研究的一些主题。马达加斯加：村上收集了侧柏科、苦参科和其他一些蕨类植物进行分子系统发育分析。其中一个结果揭示了一个世界性物种--紫薇科的高度种内变异。玻利维亚，阿根廷：西田在玻利维亚采集了五味子科、薄荷科和侧柏科植物，而青木烟草属和豆科植物用于分子系统发育分析。青木还在阿根廷收集了烟草物种。Blechnaceae的材料将主要根据比较形态来阐明目前该科的系统学。新喀里多尼亚：浅川采集的第三纪硅化木。目前已鉴定出可与棕榈科和山茶科相媲美的木材。婆罗洲：Setoguchi在山上采集了柏属、豆科、棕榈科等植物。基纳巴鲁。Platicerium的新系统发育将在世界范围内收集的基础上提出，包括1998年在马达加斯加采集的一个。作为一个整体，试图从分类上解释从蕨类到双子叶植物的某些植物群的当前分布格局及其历史的新结果正在获得。

Field collection has been made in the following nations by each or group of investigators. Results based on collected materials will be published in scientific journals. Nishida and Asakawa reported some topics concerning this field research in relation to the Gondwana Continent in two popularbooks recently published.Madagascar: Murakami collected Aspleniaceae, Qsmundaceae and some other fern families for molecular phylogenetic analysis. One of the results being obtained revealed high intra specific variation of a cosmopolitan species, Osmunda regalis.Bolivia, Argentina: In Bolivia, Nishida collected Schizaeaceae, Blechnaceae, and Aspleniaceae, while Aoki genus Nicotiana and Leguminosae for molecular phylogenetic analysis. Aoki also made collections of Nicotiana species in Argentina. Materials of Blechnaceae will clarify present systematics of the family chiefly based on comparative morphology.New Caledonia: Asakawa collected Tertiary silicified woods. Woods comparable with Palmae and Proteaceae have been identified by now.Borneo: Setoguchi collected Platycerium, Pedaliaceae, Palmae, etc. at Mt. Kinabaru. New phylogeny of Platicerium will be presented soon based on worldwide collection of the species, including the one collected in Madagascarin 1998.As a whole, new results intending to explain present distribution pattern and its history of someplant groups taxonomically ranging from ferns to dicots are being obtained.