Abstract
Previous workers have shown that asci of the Neurospora crassa morphological mutant peak are swollen, and that ascospores are not linearly ordered. In the swollen asci, spindle orientations are abnormal at all three divisions but other events of meiosis and ascospore formation are apparently normal. In the present study, cytological features of ascus development in crosses involving peak are reported in greater detail. The swollen peak asci fail to differentiate apical pores, and mature ascospores are not discharged from the perithecia. The rare linear peak asci form normal apical pores, however. Ascus morphology is described in crosses of peak and two other dominant ascus mutants.
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