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Abstract: Since the confirmation of secondary homothallism of the mycelium of cultivated mushroom, Agaricus bisporus (RAPER and RAPER, 1972; RAPER et al., 1972), the writers have worked on nuclear selection of the mycelium under various culture conditions (WANG et al., 1974). The reason for such a phenomenon appears to attribute to asynchronous nuclear division of the two kinds of nuclei having different mating type (WANG, 1972; WANG et al., 1974). This paper presents nuclear distribution in each cell of hyphal systems of fertile cultures of the mushroom grown on slide cultures in connection with the previous hypothesis that the fruiting of the mushroom requires a certain range of nuclear ratio (WANG, 1972).
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