中国蕨科的数量分类研究

本文用聚类分析的方法,对中国蕨科23个种代表9个属做了数量分类研究,通过23OTUs×37个性状的原始数值矩阵标准化后,用欧氏距离系数计算相似性,采用WPGMA法进行聚类分析,以探索各属之间的系统位置和亲缘关系。其结果与我国植物学家经典分类处理基本上一致,并对粉背蕨属(Aleuritopteris)也做了修正,认为粉背蕨系(Ser.Farinosae)和银粉背蕨系(Sef.Argenteae)也可做为两个新属处理比较合理。另外对距离系数和结合线在类群划分申的作用进行了讨论和评价。

A NUMERICAL TAXONOMY OF THE FAMILY SINOPTERIDACEAE

By means of numerical taxonomic method, 9 genera, 23 species of the family Sinopteridaceae were studied. Through standardizing an original data matrix with 23 OTUs×37 characters, we used the Euclidian distance coefficient as similarty measure and utilized WPGMA as cluster analysis method, the results were shown as follows. (1) The genus Aleuritopteris should not be combined with the genus Cheilosoria, Pellaea or Doryopteris, but ser. Argenteae and ser. Farinosae of Aleuritopteris should be divided into 2 new genera. The genus Leptolepidium should be considered as a separate genus.( 2 ) Some Pellaea species from China should be kept in the genus Pellaea and should not be merged into the genus Mildella.( 3 ) In dendrogram of the cluster analysis on the species of the family Sino-pteridaceae, the genera systematic position and relationship between them were clear. The result was in agreement with the opinion of R. C. Ching's from morphological taxonomical study in Sinopteridaceae.( 4 ) The genus Cryptogramma should belong to Sinopteridaceae. but it might be a genus of the tribe Cryptogramma and should not be treated as a family, Crypto-grammaceae.( 5 ) The genus Onychium should not be refered to Sinopteridaceae and should be removed out the family.( 6 ) On numerical method, we discussed and evaluated the distance coefficient. The combined line were satisfactorily applied to divide taxa.