1. C. annuum var. grossum was easily grafted on C. annuum by the wedge grafting method. In general cases the growth of the scion showed a tendency to be inhibited by the stock. 2. Of 18 grafting plants 14 were normal, while 4 were morphologically different, particularly with respect to the stocks. Of these 4 plants, one (grafting plant No. 1) showed remarkable variations in both vegetative and reproductive organs, so that the stock of this grafting plant was examined in details morphologically and histologically. 3. The cytological studies of the stock of the grafting plant No.1 were carried out at the meiotic stages. The most outstanding abnormalities were nuclear destruction at prophase and stickiness of chromosomes at 1st and 2nd metaphase. 4. The pollen abortion was investigated in both the scion and stock of the grafting plant No. 1. About 49 per cent of the pollen grains were abortive on the scion, while about 38 per cent on the stock.
1) This paper presents 19 species of Mougeotia known to our country. Among these, 8 species are newly found in the writer's materials collected from various localities in Japan. Other 11 species previously recorded by the writer or other workers have been collected from new localities which are listed with all previous records in Japan. 2) Mougeotia austrica Czurda, M. globulispora Jao, M. gracillima (Hassall) Wittrock, M. lamellosa Jao, M. punctata Wittrock and M. rotundangulata Jao have been newly recorded in Japan.