Abstract
Growth rate in Conchocelis-filaments under some environmental conditions has so far been examined measuring the elongation of main filaments only for horizontal direction in shell matrix. In this paper the elongation of filaments for vertical direction besides for horizontal direction was measured in order to elucidate the effects of light intensity and sea water concentration on the growth rate. Results are as follows: 1. It seems that the vertical filaments grow most rapidly under 2000 lux irradiation. But these cease to grow under the irradiation less than 5 lux. (Fig. 2, a; Fig. 2'). 2. In half diluted sea water, the vertical growth is a little worse than in the normal. Such filaments cultured in extremely concentrated (twice) or diluted (one eighth) sea water show no more elongation for vertical direction (Fig. 3, a). 3. Under the identical experimental conditions, both growth rates for vertical and horizontal directions scarcely show large gaps in the trends obtained in experiments (Fig. 2, a•b; Fig. 3, a•b).
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