Formation and multiplication of double cells in a green alga, Micrasterias crux-melitensis (Ehrbg.) hass.

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Abstract
When kept at 4.degree. C for 24 h, growing cells of M. crux-melitensis lost their septa or cell walls which had separated the cells into 2 daughter cells, forming binucleate cells. These binucleate cells grew into double cells, each of which consisted of a middle section and 2 side sections. Five types of multiplication for the double cells were observed: 2 normal cells and a double cell were produced from a double cell in the 1st type; a normal cell, an anucleate cell and a double cell in the 2nd type; 2 presumably anucleate cells and a double cell in the 3rd type; an apparently normal cell and a triple cell in the 4th type; and a quadri cell in the 5th type. These 5 types originated from different distributions of daughter nuclei in the daughter cells. When the middle section of a double cell was very small, no daughter half cells were formed from the middle section, though the middle section had 2 nuclei in it. The anucleate cell and the effect of the position of the nucleus upon the growth of daughter half cells are discussed.