2021 年 47 巻 4 号 p. 175-182
Freshwater red algal specimens that were collected from the streams or watercourses in Komagane City, Nagano Prefecture and Daisen Town, Tottori Prefecture, Japan were identified as Sheathia abscondita Stancheva, Sheath & M.L.Vis (Batrachospermaceae, Batrachospermales) using rbcL DNA analyses. This is the first record of the species from Japan. This species was segregated from the homocorticate species of Sheathia, S. arcuata (Kylin) Salomaki & M.L.Vis in 2020, mainly via DNA sequences based on materials from California, Washington and Hawaii, and therefore, S. abscondita didn’t have enough information on its distribution outside of U.S.A. The finding of this species from the two localities suggests that S. abscondita is hidden under “S. arcuata” reported from Japan so far, because this name tends to be used for most brown batrachospermacean algae based on limited morphological observations.
