The present paper deals with descriptions of ten species of marine red algae, including one new species, from Xisha Is1ands. A critical comparative study has been made of various species of Wrangelia Three new sections of the genus Wrangelia are proposed on the basis of various types of cortex. The tetrasporangia of Wrangelia tagoi (Okam.) Okam. et Segawa and Tolypiocladia glomerulata(Ag.)Schmitz as well as the spermatangia of Vanvoorstia coccinea J. Ag. are new1y described. The specimens studied including the type specimens are all deposited in the herbarium of the Institute of Oceanology，Academia Sinica at Qingdao.