An endangered freshwater alga, Thorea gaudichaudii C. Agardh, is found from a “Kamigo” spring on Yoron Island, Ryukyu Islands, Japan, representing the second habitat for the species on this Island.

与論島におけるシマチスジノリ Thorea gaudichaudii C. Agardh の生育地追加記録(岸本和雄・藤田喜久・麓才良・香村眞徳)