抄録
Three unreported species of the genus Lejeunea were recently found in Japan, namely, L. exilic, L. sordida and L. umbilicata. They occur on mid-slope to summit areas of Minami-Iwo Island of the Iwo (Volcano) Islands, northwestern Micronesia. L. sordida is also found on Chichijima Island of the Ogasawara (Bonin) Islands. Based on the Japanese plants, descriptions, figures and notes are provided. Additionally, a key to the species and a synopsis of the genus Lejeunea in Japan are given.
