ホシツリモNitellopsisの分布について

抄録

The worldwide distribution of Nitellopsis was reviewed here especially based upon the recent works by a few authors. With regards to Japan, the habitats of this plant were first reported by the author, which showed a special type of distribution in Japan, limited in central Honshu, along the Fossa Magna line (Fig. 3). Furthermore, horizontal and vertical distributions in each lake were clarified (Fig. 4-8). That is, the level of Nitellopsis zone in the lake usually consists of the second zone from the deeper limit of the Charophyta plant, and it ranges from 4 to 12 m deep which corresponds to a depth deeper than the depth of transparency in each lake. In Japan, at least in lake Ashino-ko, Nitellopsis seems to be perennial, because the author observed this plant growing luxuriantly there in the winter of 1955 up to 1958.