Abstract: The comparative study时the mode of sporogenesis in algae is of pouch importance fer both identifying their taxonomic position anal for finding out the relationship of genealogical germination between them. The materials used in this study were Gratelopia filicina and G. ramosassima collected from the seashore of Xiamen in the Dong Hai Sea. The results obtained from the comparative observation. on their sporogenesis were as follows: 1)The size of both tetraspores anal earpospores of Gratelopia filicina were similar to each other, liberated. spore about 15μm in diameter, al spherical. There was a nucleus in the center of the spore. Nlost of chromnplasts gathered in the center of cell were yellobrown in colour. Both carpospores and tetraspores of Gratelopia filicina were about 17μm slightly bigger than that of G. filicina, and their chromopIaste showed dark--brown m colour. 2) According to our observation, the modes of sporogenesis of both G. filicinaand G. ramosassima were all“ mediate disoal type"，However, the germinal form of their irxitiaI stage had a bit of difference which nrzay be considered as the difference of species.