May 31,1924 
Fusarium moniliforme 
911 
DESCRIPTION OF STRAIN Y 15 
The macroconidia of strain Y 15 (fig. 2 and 3) are produced in pseudopionnotes 
or sub-effuse sporodochia rather than in well-rounded, distinct sporodochia as in 
Y 29. Ten representative macroconidia from the sources shown in Table I 
were measured and the averages of these measurements are given in Table I. 
It will be noted that 3-septate conidia predominate, but in the cases of certain 
sporodochia considerable percentages of 5-septate conidia were produced. 
Table I .—Average sizes of 3 -, 4-, and 5-septate macroconidia , respectively , of 
strain Y 15 and percentages of each , from different sources 
Age of 
cultures 
Source 
Average sizes and percentages of each group in the total number— 
3-septate 
4-septate 
5-septate 
Days 
69_ 
42_ 
42_ 
54.. 
36. 
Aerial mycelium... 
Sporodochium.. 
Aerial mycelium.. 
Pseudopionnotes. .. 
Per 
cent 
90 
54 
95 
79 
100 
79 
83 
Microns 
3.15 by 32.18 
3.32 by 30.18 
3.00 by 30.18 
3.00 by 28.91 
3.50 by 32.30 
3.00 by 34.49 
3.17 by 35.65 
3.16 by 31.98 
Per 
cent 
1 
0 
0 
10 
0 
0 
0 
Microns 
3.00 by 40.00 
3.00 by 37.50 
Per 
cent 
9 
46 
5 
11 
0 
21 
17 
Microns 
a 3.00 by 44.60 
3.00 by 45.27 
« 2.60 by 41.50 
3.00 by 42.45 
41. 
55. 
Sporodochium. .. 
_do. 
2.90 by 43.40 
3.14 by 43.67 
3.91 by 43.70 
Average_ 
a Only one seen, not included in average 
Strain Y 15 produces blue-black globoid bodies resembling, macroscopically, 
the perithecia of Gibberella saubinetii (Mont.) Sacc., but smaller, being only 45 to 
90ju in diameter. These are especially numerous in potato-dextrose agar, oc¬ 
curring as tightly packed groups or aggregates embedded in the medium. Micro¬ 
tome sections indicate that they are made up of what appears like outer walls 
of true perithecia, and have a small or no central empty space. 
DESCRIPTION OF STRAIN Y 29 
The macroconidia of Y 29 (fig. 4) are similar to those of Y 15 (fig. 2 and 3) 
except that 5-septate conidia are more common in the former strain. They 
predominate, in fact, and a number of 6-septate conidia also have been noted. 
As in the case of Y 15, 10 representative macroconidia from the sources noted 
in Table II were measured and the averages of these measurements are given in 
Table II. It will be noted that the length of the macroconidia averages some¬ 
what greater in Y 29 even when equiseptate spores are compared. 
Table II .—Average sizes of 3~, 4~> 5 -, and 6-septate macroconidia , respectively , of 
strain Y 29 and percentages of each , from different sources 
Age 
of 
cui- 
Source 
tures 
Days 
Per 
cent 
61... 
69:.. 
42.. . 
54.. . 
36.. . 
Sporodochium 
.l.-.do_ 
Sporodochium 
7 
5 
5 
Average 
Average sizes and percentages of each group in the total number— 
3-septate 
Microns 
o3.50 by 36.60. 
2.92 by 36.34. 
3.00 by 38.03. 
3.00 by 37.50. 
3.00 by 37.80. 
2.98 by 37.42. 
4-septate 
Per 
cent 
Microns 
2.98 by 44.19. . 
12 
3.00 by 44.73. 
2.99 by 44.46. . 
Per 
cent 
93 
81 
95 
5-septate 
Microns 
Per 
cent 
3.44 by 53.98. 
2.87 bv 53.90. 
3.50 by 60.83. 
3.00 by 54.90. 
3.00 by 58.20 
2 
6-septate 
Microns 
62.92 by 61.13 
c3.00 by 69.30 
<*3.60 by 63.50 
3.16 by 56.36. 
o Only one seen, not included in average. 
6 Seven measured. 
« Four measured. 
<* Two measured. 
