SYNTHETIC STUDY ON THE ORIGIN OF CIRCUM-ANTARCTIC DISTRIBUTION

每个调查员或调查组在下列国家进行了实地收集。基于收集材料的结果将在科学期刊上发表。Nishida和Asakawa在最近出版的两本通俗读物中报道了与冈瓦纳大陆有关的这一领域研究的一些主题。马达加斯加：Murakami收集了铁角蕨科、贯众科和其他一些蕨类科进行分子系统发育分析。玻利维亚、阿根廷：在玻利维亚，西田收集了裂殖花科、乌毛蕨科和铁角蕨科，而青木属的烟草和豆科植物进行分子系统发育分析。青木还在阿根廷收集了烟草物种。乌毛蕨科的材料将主要基于比较形态学澄清该科的现有系统学。新喀里多尼亚：浅川收集的第三纪硅化木。婆罗洲：Setoguchi在Mt.鬼原根据1998年在马达加斯加采集到的标本，将很快提出该属的新的分类系统。总的来说，从蕨类植物到双子叶植物的一些植物类群的分布格局及其历史正在得到新的解释。

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.