Abstract / Introduction / Summary:

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