贵州盘星藻属的分类

CLASSIFICATION OF THE GENUS PEDIASTRUM FROM GUIZHOU,CHINA

鉴定了在１９８６年到１９９１年间采自贵州省各地３９个县市的１４６５号藻类标本，得到盘星藻属藻类５种８变种，其中包括１新变种；Ｐｅｄｉａｓｔｒｕｍｓｉｍｐｌｅｘｖａｒ．ｑｕａｄｒｉｌｏｂｕｓＹ．Ｘ．Ｘｉｏｎｇ和１中国新记录变种：Ｐ．ｓｉｍｐｌｅｘｖａｒ．ｅｃｈｉｎｕｌａｔｕｍＷｉｔｔｒ．。笔者在进行大量扫描电镜观察的基础上，参照Ｊ。Ｋｏｍａｒｅｋ（１９８３）的观点，对本属的部份种类进行了一些变动；将老种卵形盘星藻Ｐ。ｏｖａｔｕｍ（Ｅｈｒｅｎｂ）Ａ．Ｂｒ、具孔盘星藻Ｐ。ｄｕｏｄｅｎａｒｉｕｍ（Ｂａｉｌ．）Ｒａｂｅｎｈ等种类合并为单角盘星藻Ｐ．ｓｉｍｐｌｅｘＭｅｙｅｎ．并作为异名。赞成将斯氏盘星藻Ｐ。ｓｔｕｒｍｉｉＲｅｉｎｓｃｈ降为单角盘星藻的１个变种；单角盘星藻斯氏变种Ｐ．ｓｉｍｐｌｅｘｖａｒ．ｓｔｕｒｍｉｉ（Ｒｅｉｎｓｃｈ）Ｗｏｌｌｅ。不在四角盘星藻Ｐ．ｔｅｔｒａｓ（Ｅｈｒ．）Ｒａｌｆｓ．种下设变种等。

During 1989-1991 the author made a number of collections,getting 1465 samples from 39 counties and cities of Guizhou Province.The identification result shows that there are 5 species and 8 varieties of Pediastrum in Guizhou.Among them,P.Simplex var.quadrilobus Y.X.Xiong is a new variety and P.simplex var.echinulatum Wittr is recorded for the first time in China.According to J.Komarek's system(1983),the 13 taxa are described,and a key to the species and varieties including their distributions in Guizhou is also given in the paper.