Among the various plants, we find the race with the fasciated stem. The fasciation of plants is able to classify two groups-the inborn and the acquired-, on account of the origin of its appearance. The fasciation in this plants belongs to the former group. Then the plant bearing this character breeds true to this character at the next generation. The morphological and physiological study of the character in this plant was carried through the water culture and the microscopic treatment by Mr. Y. Yamaguchi in 1916. The genetic study of the character in this plant was reported pieliminarily by the author in 1923. By the raising of the further generation in 1924, the author have been able to prove the evidence for my opinion in the preliminary reports-that the fasciation is constituted geneticaly by the cooperation of two recessive factors, the one of these factors designated as p for“Kudyakuba”(i.e. the leaf-294 THE shape gene) the other factor f′ having activity to fasciate the normal stem only when it presents in the same germ-cell with the recessive gene (p). Considering Mr. Yamaguchi′s conclution that the suitable density of the Knop′s solution for the developing of this character is 5%, the author can take such a explanation that the favorable density to develop the activity of these genes is 5%. A few normal individuals among the offsprings of the fasciated parent may be not owing to the result of such the external influence, but their origin to the factor-transformation as followings: p→P, f→F.
1. The camellia double flower behaves as a Mendelian recessive to the common double flower, and the factor for this camellia double flower gives manifold effects to leaves and growing habit. 2. The crossing between the single flower and the common flower gives the 306 THE single flowered hybrids, and these hybrids give the single flowers and the common double flowers in the ratio 9:7 in F2. 3. The factors producing the flower-colour of this plant are as follows:-M, for the red flower; m, for the pink flower. P, changes the pink flower into purple, and produces the redish purple colour with M. 4. Some white flowers produce eversportingly the colour flowered and the striped flowered mutants. 5. A fasciated plant appeared among the normals, perhaps, may be new mutants.
The only species of Cyathea C. spinulosa, WALL.-is known in Japan. The stems of this species collected in different places show the remarkable structural differences in the form of meristeles, in the outline of sclerenchymatous sheaths and in the presence or absence of cortical bundles. These different characters are communicated with each other by intermediate types, and can not be considered as the specific differences. The species from Formosa, however, shows a somewhat different construction in the form of meristeles, and seems to be a different species or varity.