235 
Species of Olpidiopsis , (Cor mi) Fischer . 
7. Nuclear division is mitotic with the spindle intranuclear. The 
number of chromosomes is approximately six. No centrosomes nor any 
other indication of nuclear polarity was observed. 
8. These forms seem to be primitive sexual organisms of the Oomycete 
type. The influence of external conditions on the development of the 
sexual stage, the mode of fertilization, the unequal size of the two gametes, 
and the apparent morphological equivalence of these gametes with the 
sporangia, seem to the writer to point to that assumption. 
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