Abstract: Fifteen new taxa of the Desmidiaceae are described and illustrated from the Hengduan Mountains region of China. They are Euastrum gemmatum f. denticulatum, Cosmarium asphaerosporum var. subcapitum, C. dovrense var. fontanum, C. foveolatum, C. sichuanense, C. subdanicum var. granulatum, C. subsuperbum, C. tibeticum var. papilliferum, C. venustum var. arcuatum, C. yunnanense, Staurastrum elaticeps var. eximium, S. longiradiatum f. basispinulosum, S. pseudosebaldi var. compactum f.reductum, S. sebaldi var. ornatum f. spiniferum,S. sonthalium f. spiniferum.

Key words: Euastrum, Cosamrium, Staurastrum, New taxa