24 
Research Bulletin No. I 
thus producing a pulled out appearance (PL XXV, figs. 2, 4, 
5, and 7). This last point of contact gives rise to the toe, one 
edge formed by the wall to the foot, and the other edge is usually 
lost (PI. XXV, figs. 2, 4, 5, and 7), but retained in such spores 
as we find in figures S and L on page 38 of Appel and Wollen- 
weber 1910. Slow growth favors the development of these parts, 
while in rapid development they are lost. The one- and non- 
septate spores which are developed rapidly show no such modi- 
fication. Tn general we do not find that the structure of the 
basal and apical cell of this species develops anything that can 
be considered sufficiently characteristic to be used as a specific 
character. All sorts of stages are shown in the plate, so that 
each one can judge for himself, as it is possible that one who 
has studied a great number of species of Fusarium will be able 
to pick out the characteristic form which can be set aside for this 
particular species. 
The following' are some counts of spores from a culture: 
On glucose agar, 115 days old, dry. 
0- septate 1 per cent. 
1- septate 98 per cent. 
2- septate 1 per cent. 
3- f--septate Very few. 
On potato plugs in Roux tubes, some water left in the bulb. 
130 days old, ochre-color. 
0- septate Few. 
1- septate 98 per cent. 
2- septate Few. 
3- septate Very few. 
In refrigerator, potato plugs moist, temperature 8° to 10* 0., 
humidity 60 per cent. 70 days old. 
0- septate 20 per cent. 
1- septate 55 per cent. 
2- septate 10 per cent. 
3- septate 13 per cent. 
4- septate 3 per cent. 
0- septate 18 per cent. 
1- septate 71 per cent. 
2- septate 10 per cent. 
3- septate 1 per cent. 
4- septate Few. 
The average of six tubes which were partly dry and partly 
moist was : 
