Phylogenetic and comparative morphological studies on bryophytes

系统发育研究已经从系统发育和比较形态学的观点进行了各种brabrites组。对地钱属的细胞核和质体在细胞分裂过程中的行为进行了研究。结果表明，该属在系统发育上处于联结各分类群（包括亚群）的位置。肝科的大多数成员）具有单质体细胞分裂和那些（包括藓类、角苔纲和石松纲的蕨类植物）具有多质体细胞分裂。水丹属是本研究的目标类群之一，目前将其归入轮叶属。结果表明，该属与叶苔科的叶苔属位置最接近，不位于该属最初被描述的叶藓目的叶藓科附近或该科中。对藓属Ptychomitrium进行了组织化学研究，以获得更多关于其分类位置的信息，已将其置于Grimmiaceae，Ptychomitriaceae或Erpodiaceae中。研究结果表明，该属不属于马勃科，而属于紫藓科（Grimmiaceae），并已扩展到许多其他与藓类生殖有关的零碎研究，包括SOD在藓类中的分布、精子发生、物种形成、藓类及其近缘属的分子系统学位置、精子发生等。通过对石苔属植物精子发生过程中质体和cpDNA行为的研究，发现石苔属植物的精子发生可能为双亲负向遗传。

Phylogenetic studies have been carried out from phylogenetic and comparative morphological view points for various bryophyte groups. Special attention has paid to the liverwort genus Dumortiera and the behavior of nuclei and plastids have been investigated during cell division. The results suggested that the genus be placed at the phylogenetic position connecting the taxonomic groups (incl. most members of Hepaticae) with monoplastidic cell division and those (incl. Musci, Anthocerotae and Lycopsida of fern allies) with polyplastidic cell division. The genus Mizutania is one of target taxonomic group for the present research, which is currently placed in the genus Riccardia The results showed the genus was placed at the position closest to the genus Calypogeia of the family Calypogeiaceae, Jungermanniales, not placed near or in the family Metzgeriaceae of the Metzgeriales where the genus has originally been described.The moss genus Ptychomitrium was histochemically investigated to obtain more information on its taxonomic position, which has been placed in the families Grimmiaceae, Ptychomitriaceae, or Erpodiaceae. The results indicated that the genus is never placed in Erpodiaceae, but in Grimmiaceae (or Ptychomitriaceae).Research has been extended to many other fragmental investigations relevant to bryophyte phylogeny, including distribution of SOD(Superoxide Dismutase) among bryophytes, spermatogensis, speciation, molecular phylogenetic position on the moss genus Brotherella and its related genera, spermiogenesis. In the study on the behavior of plastids and cpDNA in the spermiogenesis in Dumortiera, we obtained the result showing the negative posibility of biparental inheritance for this liverwort.