SYNTHETIC STUDY ON THE ORIGIN OF CIRCUM-ANTARCTIC DISTRIBUTION

每组或每组调查人员在下列国家进行了实地收集。收集材料的结果将在科学期刊上发表。西田和浅川在最近出版的两本通俗书籍中报道了有关冈瓦那大陆的实地研究的一些主题。马达加斯加：Murakami收集了Aspleniaceae， Qsmundaceae和其他一些蕨类植物进行分子系统发育分析。其中一个结果显示，一个世界性的物种，奥斯蒙达帝王的高种内变异。玻利维亚，阿根廷：在玻利维亚，Nishida收集了裂科，Blechnaceae和Aspleniaceae，青木属Nicotiana和豆科Leguminosae进行了分子系统发育分析。青木还收集了阿根廷的烟草品种。蓝藻科的资料将主要以比较形态学为基础阐明该科目前的系统分类学。新喀里多尼亚：Asakawa收集第三纪硅化木材。目前已鉴定出与棕榈科和变形科相当的树木。婆罗洲：濑户口在京那巴鲁山采集了铂科、菊科、棕榈科等。根据世界范围内收集的物种，包括1998年在马达加斯加收集的物种，将很快提出新的系统发育。总的来说，从蕨类植物到菊科植物，一些植物类群的分布格局及其历史都得到了新的解释。

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.