| quantifying functional heterothallism in the pseudohomothallic ascomycete neurospora tetrasperma. | neurospora tetrasperma is a pseudohomothallic filamentous ascomycete that has evolved from heterothallic ancestors. throughout its life cycle, it is predominantly heterokaryotic for mating type, and thereby self-fertile. however, studies of n. tetrasperma have revealed the occasional production of self-sterile asexual and sexual spores of a single-mating type, indicating that it can be functionally heterothallic. here, we report the extensive sampling and isolation of natural, heterokaryotic, st ... | 2012 | 22954339 |