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This is a first report on the occurrence of  Gelidiella fanii  outside of Taiwan, where it was recently described as a new species. New specimens have been collected from Thailand, Indonesia, Japan, and the Philippines. The species commonly occurred on rocks and crustose algae in the intertidal zone at locations visited. Thalli had downward curving unilateral branchlets, numerous hairs around branch tips, iridescent color under water, and clublike tetrasporangial stichidia with blunt tips. Two genes were analyzed from different organelle genomes: plastid  rbc L from 13 specimens and mitochondrial  cox 1 from 24 specimens including putative relatives. Analyses of both  rbc L and  cox 1 sequences revealed that  G. fanii  was strictly separated from other species in the genus. This is the first report on  cox 1 gene sequences in the order Gelidiales. Nine  cox 1 haplotypes were found in  G. fanii ; there was a biogeographic structure, except for the Japanese haplotype, which grouped with those from Thailand. The present study indicates that  G. fanii  is common in Thailand and probably in the southeastern Asia region.  G. fanii  was more closely related to an identified  Gelidiella  sequence from South Africa, which is morphologically similar to  G. acerosa . Detailed observations of field-collected material will enable a more realistic evaluation of the distribution of  G. fanii  in tropical and subtropical waters of the world.

Additional records of Gelidiella fanii (Gelidiales, Rhodophyta) from the western Pacific based on morphology, rbc L and cox 1 analyses