Abstract
The distribution of Bazzania in Pacific Asia excluding Malesia is surveyed. The taxonomic diversity in this genus increases from North to South, while the regional taxonomic composition of Bazzania is rather gradually changes and compared regions are distributed strictly along a latitudinal gradient on the DCA scatter plot. Particular attention is paid to the distribution of Bazzania in Vietnam, for which considerable data were obtained in recent decade. A list of Bazzania of Pacific Asia is provided with distribution by country, as well as more detailed species list for this genus in Vietnam. The world centers of Bazzania species diversity are located in Malesia and Melanesia, where the former is adjacent to Pacific Asia in the northwest. Bazzania siamensis comb. nov. is proposed, the species is treated as different from B. pearsonii with which it was synonymized before. A description and photographs of the species based on lectotype are provided.
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