A Dry Rot of the Irish Potato Tuber 
27 
Table 2. — Representing in percentages the fluctuation of spore 
septation of a culture grown in a refrigerator, temperature 
8° to 10° C, humidity 60 per cent. 
O-septate 
1-septate. 
2-septate. 
3-septate. 
4-5-septate. 
February 16 
February 23 
March 1 
March 8 
. Tube A 
0 
17 
15 
32 
B ... 
7 
8 
10 
12 
C 
0 
6 
3 
t 
D 
2 
3 
9 
17 
Average 
2 
8 
9 
17 
Tube A 
29 
51 
57 
56 
B .... 
30 
40 
43 
53 
C 
30 
47 
43 
61 
D 
18 
46 
60 
74 
Average .... 
27 
46 
51 
61 
. Tube A ' 
27 
19 
16 
7 
B 
25 
21 
21 
18 
C 
28 
18 
15 
20 
D 1 
20 
19 
16 
6 
Average .... 
25 
19 
17 
13 
Tube A 
44 
12 
12 
5 
B 
36 
31 
26 
17 
c 
42 
32 
39 
12 
D 
54 
32 
15 
3 
Average .... 
44 
27 
23 
9 
te. Tube D 
7 
