

2017), and this plant is now being actively studied. In the last decade, the liverwort, Marchantia polymorpha, has also attracted attention as an additional model, with the report of its genome sequence in 2017 (Bowman et al.

The moss, Physcomitrium patens began to attract attention in the late 1990s as a model for mosses and as the first bryophyte whose whole genome was revealed (Schaefer and Zryd 1997 Rensing et al. Thanks to the huge efforts made by the plant community to gather data on the genome sequences and expressed genes in various plants, it is now no longer necessary to focus on only one type of a model plant to study. Based on the research background of the editors, we thought about whether to include Physcomitrium (Physcomitrella), Bryophytes-mosses, liverworts, and hornworts-or more broadly flagellated plants, i.e., photosynthetic eukaryotes that have not lost (sperm) motility (see, iMOSS, international molecular moss science society iMOSS web page, ).

When we received the proposal for the special issue, we first thought about how we would title it. The Editors are pleased to present a special issue on the molecular biology of mosses.
