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Previous taxonomic studies reported that nine species of  Martensia  (i.e.,  Martensia albida, Martensia australis, Martensia bibarii, Martensia elegans, Martensia flammifolia, Martensia fragilis, Martensia jejuensis, Martensia projecta , and  Martensia palmata ) occur on the Korean coast. Our recent  Martensia  collections from various localities in Korea contain many specimens with a huge range of morphological variation and are difficult to classify into the named species. In this study, we analyzed DNA sequences of  rbc L and COI genes to access their phylogenetic relationships and to verify taxonomic status based on morphological observations. The molecular analyses revealed that only two species of  Martensia  occur in Korea ( M. albida  and  M. jejuensis ).  Martensia albida  is characterized by having entire margins of blades with a single band of networks, whereas  M. jejuensis  is distinguished from the other species by possessing projections along the margins of the networks and blades. Both molecular analyses and morphological observations revealed that  M. flammifolia  is a member of the genus  Nitophyllum . Some features (e.g., thallus habit, branching patterns, blade morphology, positions of reproductive structures) are not reliable for species identification. Our results indicate that the  rbc L and the COI gene have sufficient resolution for delimitation at both species and generic levels in the subfamily Nitophylloideae.

Reappraisal of nine species of Martensia (Delesseriaceae, Rhodophyta) reported from Korea based on morphology and molecular analyses