天草増産に関する基礎的研究-VI

マクサ (Gelidium amansii L_MX.) の初期発生について

抄録

In the present paper the author dealt with the details of the early stages in the development of the Gelidium amansii collected at Izu Peninsula, middle Japan. He found that:
1. The carpospore and the tetraspore germinate immediately after liberation, in the same type, or indirect germ-tube type.
2. The resting spore begins to sprout out a germ-tube in several hours after liberation, then the full contents of the spore move into the germ-tube (Pl. 1, 1-3).
3. The first division occurs with parallel or oblique plane to the longitudinal axis of the germ-tube producing the upper and the lower cell (Pl. 1, 4-5). The situation of the daughter cells occurred in such way has an important meaning in the process of the coming morphogeny.
4. The cell-group originated from the upper cell grow upto the creeping stem of the frond, and that originated from the lower one gives out the primary rhizoidal-cell in the beginning and then the erect main stem or creeping part of the frond later (Pl. 1, 6-11). The primary rhizoid appears from the apical cell originated from the lower cell-group about 38 hours after settling of the spore.