日本における Didymosphenia geminata （Lyngb.） Mart.Schmidtの出現について

抄録

Didymosphenia geminata (Lyngb.) Mart. Schmidt was found in the original sketch collection by the late Dr. Masayuki Watanabe. It was illustrated using a sample taken from Lake Panketo on the 13th August, 1966 (TNS-AL-50254). This old record suggests that D. geminata is native to Japan. In addition, its rarity and restricted distribution to the cool waters in alpine areas indicate that it is not a ‘new ecotype’ as described by Whitton et al. (2009).