抄録
1. Shedding season for Gelidium begins when the water temperature rises up to 20°C (tetraspore) and 24°C (carpospore). Shedding occurs daily in the afternoon. Ca. 104-105 spores are shed from 1gr. frond in a day. 102 spores were found in 1 L. of sea water nearby the Gelidium field in the afternoon.
2. The control on the shedding has not yet succeeded. The spores fix themselves on the rock surface after lying in contact with it for more than ten minutes. Therefore at present, the possibility for artificial sowing of the Gelidium spores directly on to the rock surface is slight in contrast to the case of Gloiopeltis.
