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SUMMARY Recent collections from marine and freshwater locations have enabled the investigation of diversity of Prasiola in Japan. Sequence data from the rbc L and tuf A markers revealed the presence of three marine species and one freshwater species. Prasiola delicata was confirmed to occur on Daikokujima, Prasiola calophylla was found for the first time in Japan from Hokkaido, and a species within the P. meridionalis/linearis/stipitata complex was found on both Hokkaido and Daikokujima. Collections from a range of populations of freshwater Prasiola, identified here as P. japonica, were found to be conspecific and identical in rbc L and tuf A sequences to freshwater collections from Nepal, Korea, and China.

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