May 31, 1924 
Fusarium moniliforme 
913 
In addition to these differences in morphology of macroconidia, strain Y 29 
differs from Y 15 in that it shows a strong tendency to produce sporodochia of 
the usual Fusarium moniliforme vinaceous-cinnamon (19) and related shades, 
and also, sometimes produces blue-black plectenchymic sporodochia. Further¬ 
more, strain Y 29 rarely produces the blue-black spherical bodies described for 
Y 15. 
PRODUCTION OF AN ASCIGEROUS STAGE IN CULTURE 
The blue-black globoid bodies described in Y 15, and found in a few of the 
total number of strains that have come into the laboratory, suggested the pos¬ 
sibility of a perfect stage. This led to constant examination of cultures for such 
a stage and to considerable experimentation in an effort to produce it. Various 
media, low and high temperatures, alternation of low and high temperatures, and 
other environmental variations were tried in culturing the fungus, but all failed 
to produce such a stage. 
In September of 1922 perithecia appeared in a tube in which both Y 15 and Y 
29 had been planted. The Y 15 had been placed at the top of the slant and the 
Y 29 at the bottom, and the perithecia developed along the line of contact of the 
two. The same thing occurred in the other of the two tubes similarly inoculated. 
In an experiment started at that time a majority of 130 Petri dishes and tubes 
planted with both Y 15 and Y 29 produced perithecia (PI. 1, A, B, C), while none 
of the 59 planted with Y 15 alone, and none of the 62 planted with Y 29 alone, 
