A brief overview of and key to species of Collema from China

Forty-seven taxa of the lichen genus Collema belonging to 33 species are reported in the present paper. Among them, the following nine taxa are new to China: Collema coccophorum, C. furfuraceum var. luzonense, C. kauaiense, C. nepalense, C. nipponicum, C. poeltii, C. polycarpon, C. subnigrescens f. caesium, and C. tenax var. expansum. A key to the known species from China is given. Collema pulchellum var. leucopeplum and C. latzelii are excluded from the lichen flora of China.