Abstract: In this paper, Metasasa W. T. Lin was treated as a new synonym of the genus Acidosasa C. D. Chu et C. S. Chao ex Keng f. A new combination, Acidosasa nanunica (McCl.) C. S. Chao et G. Y. Yang, was given. Metasasa carinata W. T. Lin and Metasasa albo-farinosa W.T. Lin were reduced as synonyms of A. nanunica.

Key words: Metasasa, Acidosasa, Synonym