Research on Phylogeny and Speciation in Osmundaceae (Pteridophytes)

为了阐明紫薇科植物的生物多样性，设计了两个生物学分析方向，即(1)基于系统发育研究建立自然分类系统，(2)在物种形成研究的基础上补充植物属植物的专题修订。(1)自然分类系统。在分子系统发育和合作解剖学研究的基础上，提出了由4属6亚属组成的新系统。紫薇属被认为是一个单型属，尽管第二个种--克氏紫薇通常被归入其中。OSumunda claytoniana)作为紫薇属下的一个单型亚属，并对该亚属提出了一个新名称，并作了新的描述。(2)专题性修订。紫薇科植物广泛分布于世界各地。根据重要地区的标本馆资料和实地调查，进行了专题性修订。该科植物17种，其中紫薇科1种，紫穗科2种，细翅目6种，紫穗亚属8种，粘虫亚属1种，亚属3种。Osmunda和4个亚属。Plenasium。通向属、亚属和种的钥匙已经准备好了。所有的分类群都被列举出来，每个都有适当的同名和简短的描述。本专著将作为《植物物种》或《世界植物志》的一部分出版。(3)物种形成分析。推测中间紫草起源于日本野生稻和普通野生稻的杂交。这一点得到了细胞遗传学证据的认可，并对这些复合体进行了分子分析，以了解它们之间的关系。

To elucidate the biodiversity in Osmundaceae, two directions of biological analysis were designed, i.e. (1) establishment of natural system of classification based on phylogenetic researches, and (2) complement of monographic revision for Species Plantarum, based on research in speciation.(1) Natural system of classification. A new system of 4 genera and 6 subgenera is proposed, based on the research on molecular phylogeny and cooperative anatomy. Osmundastrum is treated as a monotypic genus, although the second species, O. claytoniana, was usually included in it. Osumunda claytoniana, is then treated as to form a monotypic subgenus under the genus Osmunda, for this subgenus, a new name, Claytosmuda, is proposed with a new description.(2) Monographic revision. Osmundaceae is widely distributed throughout the world. Based on the herbarium materials and field surveys in some important localities, monographic revision is compiled. All the 17 species of this family are classified as : 1 in Osmundastrum, 2 in Todea, 6 in Leptopteris, and 8 in Osmunda, 1 in subgen, Claytosumunda, 3 in subgen. Osmunda, and 4 in subgen. Plenasium. The keys to genera, to subgenera, and to species are prepared. All the taxa are enumerated each with proper synonymy and brief description. This monograph will be published as a part of Species Plantarum, or the Flora of the World.(3) Analysis on speciation. Osmunda X intermedia is inferred as originated from hybridization between O. japonica and O. lancea. This is recognized by the evidences in cytogenetics, and molecular analysis of these complex was made to understand the relationship among them.