88 AMERICAN JOURNAL OF BOTANY [Vol. 9 
Table i {Continued) 
Strain 
Source 
Genera- 
tion 
Spore Length 
Terminal Appendage 
Range 
Mean 
Range 
Mean 
Hevea ; 
leaf spot of mature 
leaves 
I 
23-32 
27.5 
20-29 
25.2 
2 
21-30 
25.2 
14-34 
23.8 
3 
21-36 
28.4 
21-36 
27-5 
4 
23-30 
26.6 
16-31 
23-7 
5 
21-31 
27.4 
16-31 
22.2 
6 
23-31 
28.6 
13-23 
' 17-5 
35 
Hevea; 
leaf spot of mature 
leaves 
I 
26-36 
29.0 
16-29 
22.9 
2 
24-37 
29.0 
16-36 
26.7 
3 
21-29 
254 
14-31 
21. 1 
4 
20-29 
26.1 
16-34 
257 
5 
24-31 
28.5 
20-33 
27-3 
Table 2. Summary of Statistical Data {All Measurements and Standard Deviations in n) 
Part I. Spore Length 
Strain 
No. of 
Genera- 
tions 
Total 
Range of 
Variation 
Range of 
Generation 
Means 
Mean 
Standard 
Deviation 
Coefficient 
of 
Variation 
I 
6 
8.0 
1.4 
19.9 
1.88 
9-5 
2 
5 
10. 0 
1.9 
20.6 
1.85 
9.0 
3 
6 
12.0 
1-5 
22.0 
1.89 
8.6 
4 
4 
10. 0 
2.0 
22.0 
1.92 
8.7 
5 
8 
12.0 
4.2 
22.0 
2.1 1 
9.6 
6 
4 
12.0 
1.8 
22.9 
2.33 
10.2 
7 
6 
lO.O 
2.5 
24.2 
1.98 
8.2 
8 
5 
9.0 
0.3 
24.6 
2.03 
8.3 
9 
5 
17.0 
5-5 
28.3 
3.60 
10.3 
10 
5 
17.0 
7.8 
28.0 
3-90 
13-9 
II 
6 
9.0 
2.4 
234 
2.23 
9-5 
12 
5 
17.0 
4.6 
26.4 
3.10 
11.7 
13 
6 
16.0 
3-9 
29.4 
3-31 
11.3 
14 
7 
II.O 
4-5 
20.7 
2.16 
10.4 
15 
6 
10. 0 
2.4 
21.6 
2.01 
9-3 
16 
6 
12.0 
2.9 
22.0 
2.34 
10.6 
17 
7 
12.0 
2.3 
22.3 
2.17 
9.8 
18 
7 
12.0 
3-2 
22.4 
2.00 
8.9 
19 
6 
12.0 
2.1 
22.5 
2.28 
lO.I 
20 
6 
17.0 
4.8 
22.5 
2.82 
12.5 
21 
6 
13.0 
4-4 
23.0 
2.51 
II.O 
22 
7 
15.0 
3.7 
23.0 
2.17 
94 
23 
5 
10. 0 
3-0 
23.2 
2-34 
10. 1 
24 
7 
12.0 
2.1 
23-3 
2.00 
8.6 
25 
5 
12.0 
2.8 
23-3 
2.02 
8.7 
26 
6 
12.0 
6.5 
23-5 
2.94 
12.5 
27 
7 
13.0 
3-7 
23-9 
2.35 
9.8 
28 
6 
II.O 
3-4 
24.2 
2.34 
9-7 
29 
8 
14.0 
4.2 
24-3 
2.67 
II.O 
30 
6 
13.0 
1-5 
24-5 
2.28 
9-3 
31 
6 
12.0 
2.2 
25.2 
2.27 
9.0 
32 
6 
10. 0 
1.9 
25-9 
2. II 
8.1 
33 
7 
16.0 
2.0 
26.3 
2.38 
9.1 
34 
6 
15.0 
3-4 
27-3 
2.56 
94 
35 
5 
16.0 
3-6 
27-3 
2.82 
10.3 
