1. The structure of the spermatozoid of Chara Braunii Gmel. is described. The electron microscope, the phase contrast microscope, and some cytochemical methods have been used to supplement the usual cytological techniques.
2. The spermatozoid-nucleus showed the fibrous structure under the electron microscope. In the cytoplasmic portion there are several spherical bodies in which about twenty granules are contained. These granules are considered to have the features of mitochondria.
3. The blepharoplast consists of two parts; one is the connecting portion continued to the spermatozoid-nucleus and the other is the motile portion attached at two flagella. The motile portion easily divides up into many fibrils.
4. The flagellum is accompanied by a plasmic fin material on one side, and the end of flagellum has a fin. The flagellum may consist of many fibrils, but the bundle of fibrils is too firm to be disbundled with the usual technique.