Appearance of Didymosphenia geminata (Lyngb.) Mart.Schmidt in Japan

Abstract

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).