Abstract
Bakerspigel, Alexander. (New Mount Sinai Hospital, Toronto, Canada.) The structure and manner of division of the nuclei in the vegetative mycelium of Neurospora crassa. Amer. Jour. Bot. 46(3) : 180‐190. Illus. 1959.—A description has been given of the structure and manner of division of the nuclei in the conidia and vegetative mycelium of the ascomycete, Neurospora crassa. This is another example of a fungus in which the vegetative nuclei do not appear to divide in the manner of classical mitosis. Instead, as division proceeds, the chromatin forms complexes of chromosomal filaments which then contract. At the end of division the contracted chromatin constricts and pulls rapidly apart without the aid of a visible spindle. Individually recognizable chromosomes were not observed to align themselves on a metaphase plate. In the vegetative mycelium of N. crassa the central body elongates and divides by constriction at the midregion. Thus at the end of division each of the sister nuclei is composed of a portion of the original chromatin and central body. It is suggested that both the elongating central body and the densely stained granule in the chromatin of these nuclei play significant roles during nuclear division.
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