Two Korean species of Spyridia J. Agardh are investigated taxonomically. Spyridia filamentosa (Wulfen) Harvey collected at Wando-Islands in the southern coast is characterized by its regularly arranged internodal and nodal cells. S. elongata Okamura collected at Kangreung in the eastern coast is characterized by its irregularly arranged internodal cells and small fusiform branches around the axis. The latter species, collected for the first time in Korea, is very similar to S. squalida J. Agardh from the Southern Australia. Some important taxonomic characters of the two species are summarized.