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In 1975, 1976 and 1980 we collected from Jinyindao (Jinyin Isle) and Chenhangdao (Chenhang Isle) of the Xisha Islands, South China Sea six numbers of upright-growing, repeatedly branched, filiform cyanophyceous seaweeds. More than one thousand specimens were collected, and detailed studies showed that they belong to the little known tropical cyanophyte Gardnerula de Toni, not previously reported from the Chinese waters. Gardnerula (Rivulariaceae, Nostocales) was established by de Toni in 1936 to receive Microcoleus corymbosa Harvey (1857) from Key West, Florida, Polythrix spongiosa Zanardini (1872) from Singapore and Sirocoleum jensenii Weber-van Bosse (1926) from Kei Island,
In 1975, 1976 and 1980 we collected from Jinyinao (Jinyin Isle) and Chenhangdao (Chenhang Isle) of the Xisha Islands, South China Sea six numbers of upright-growing, repeatedly branched, filiform cyanophyceous seaweeds. More than one thousand specimens were collected, Gardnerula (Rivulariaceae, Nostocales) was established by De Toni in 1936 to receive Microcoleus corymbosa Harvey (1857) from Key West, Florida, Polythrix spongiosa Zanardini (1872) from Singapore and Sirocoleum jensenii Weber-van Bosse (1926) from Kei Island,