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Among the eight species of  Yonagunia  described in the Indo-Pacific region, five species have been reported from Taiwan. In this study, we re-examined additional herbarium specimens which were morphologically similar to the other Taiwanese species of  Yonagunia . Two new species of  Yonagunia  ( Y. robusta  sp. nov. and  Y. stipitata  sp. nov.) were identified based on  rbc L sequence analyses, and their vegetative and reproductive structures were documented in detail.  Yonagunia robusta  is the largest species (up to 13 cm high) found in Taiwan and superficially resembles a previously described species,  Y. palmata  from northern Taiwan, but the thallus size is much larger and the branches are coarser in  Y. robusta . Young plants of  Y. stipitata  may be confused with  Y. maillardii , a species widely distributed in the Indo-Pacific, but the thallus branches are much thinner and numerous reproductive branchlets are formed in clusters in fertile  Y. stipitata. Yonagunia robusta  is widely distributed from northern to south-eastern Taiwan, whereas  Y. stipitata  is restricted to Orchid Island, a remote small island off the south-east of Taiwan. The species diversity (seven out of 10 described species) of  Yonagunia  is high in Taiwan and it is speculated that some more cryptic species will be found from the Indo-Pacific by using a combination of DNA sequence data and morphological observations. HIGHLIGHTS Ten species of  Yonagunia  have been described from the Indo-Pacific. Seven out of 10 species of  Yonagunia  are found in Taiwan. Cryptic species of  Yonagunia  will be found in the Indo-Pacific.

Systematic revision of the red algal genus Yonagunia (Halymeniaceae, Rhodophyta) from Taiwan, including the description of two new species