抄録
The phylogenetic position of the East Asian monospecific genus Hattoria has been controversial since its description in 1961. Over the years it has been considered as either a member of subfam. Jamesonielloideae in Lophoziaceae/Jungermanniaceae, subfam. Jungermannioideae in Jungermanniaceae, or Anastrophyllaceae, due to its morphological characters related to the genera with unlobed leaves, such as Jamesoniella, Scaphophyllum or Gottschelia. In the present study we provide molecular evidence that supports its inclusion in the family Anastrophyllaceae and Hattoria as a distinct genus resolved and nested in a Tetralophozia–Plicanthus clade. Our phylogenetic analyses suggest that unique morphological characters, such as unlobed and entire leaves and bracts shown in Hattoria, be considered an autapomorphy for the genus/species and also support recognition of the genus Hattoria as distinct from the other genera of the family. Some sporophyte characters including morphology of the seta are newly given for Hattoria yakushimensis (Horik.) R.M.Schust.
