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The crustose brown algal genus Endoplura has been known as a monotypic genus characterized by its intercalary plurangial reproductive structures composed of 2–4 separate parallel filaments terminated by 2–5 sterile cells and by containing several to many chloroplasts per cell. In this study, Endoplura jejuensis sp. nov. and E. koreana sp. nov. from Korea are newly described based on molecular and morphological analyses. Our phylogenetic analyses of the rbcL gene reveal that E. jejuensis sp. nov. and E. koreana sp. nov. are placed in the same clade with “E. aurea” from Japan with a strong bootstrap supporting value. E. jejuensis is characterized by small and light to dark brown crustose thalli of less than 1 cm diameter, tufts of hairs arising from the basal disc, plurangia composed mostly of two separate parallel reproductive filaments terminated by 2–4 sterile cells, and sessile unangia each with a single paraphysis. E. koreana is distinguished by olive or yellowish-brown crustose thalli of up to 3 cm diameter, tufts of hairs arising from the basal disc, and apical parts of erect filaments, plurangia with 2–5 separate reproductive filaments terminated by 2–8 sterile cells, and sessile unangia with 1–2 paraphyses. Our studies also show that “E. aurea” specimens from Japan may be recognized to be a different species from other Endoplura species.

ⓒ2019. Korean Society of Environmental Biology. branched erect filaments, plurilocular sporangia produced laterally on basal part of erect filaments and occasionally on prostrate filaments, sessile or short pedicellate plurilocular sporangia, and 2 types (big lanceolate and small ovate) of plurilocular sporangia (Saunders 1898; Setchell and Gardner 1925; Abbott and Hollenberg 1976). Feldmannia chitonicola has been reported only from eastern Pacific, in California (Abbott and Hollenberg 1976), Chile (Ramirez and Santelices 1991) and Peru (Acleto 1980). We collected unidentified tiny filamentous brown algae from west and east coasts of Korea and cultured them. We observed their detailed morphology and developmental pattern in laboratory cultures. We also analysed molecular data based on rbcL and cox1 genes for their phylogenetic relationships with others in their respective genera and a few selected species within the Ectocarpales. We identify them as Feldmannia chitonicola and add it to the Korean marine algal inventory, representing the first report of this species in western Pacific.

Acinetospora asiatica and Botrytella reinboldii are reported as two new records from S. Korea based on morphological studies and molecular analyses. A. asiatica is mainly characterized by the presence of sparsely branched uniseriate filaments with diffused meristematic zones, the formation of crampons at right angles, and the formation of plurilocular sporangia on both prostrate and erect filaments. B. reinboldii is characterized by the presence of irregularly alternating branched uniseriate filaments attached by rhizoids, and single or clustered plurilocular sporangia with a single opening. Molecular analyses of rbcL gene revealed that A. asiatica and B. reinboldii are placed within each clade of Acinetospora and Botrytella, respectively.

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