Aug. ix, 1933 
Phytophthora Faberi on Coconut and Cacao 
281 
Table III .—Summary of measurements of chlamydospores from coconut and cacao 
15.5 to 17.49 
17.5 to 19.49 
19.5 to 21.49 
21.5 to 23.49 
23.5 to 23.49 
25.3 to 27.49 
27.3 to 29.49 
29.3 to 31.49 
3i-S to 33.49 
33-5 to 33.49 
35-5 to 37.49 
37.5 to 3949 
39.3 to 41.49 
4 i -5 to 43-49 
43-5 to 45.49 
45-5 to 47-49 
47-5 to 49-49 
49-5 to 31.49 
51.3 to 33.49 
53-5 to 55-49 
55-5 to 57.49 
57.5 to 39.49 
39.3 to 6149 
61.5 to 6349. 
Total. 
Class (in microns). 
Number of chlamydo- 
spores in each class 
from— 
Coconut. 
Cacao. 
0 
0 
0 
I 
4 
0 
I 
0 
1 
r 
3 
3 
S 
3 
1 
4 
10 
7 
6 
8 
16 
25 
70 
69 
49 
69 
69 
81 
9 i 
99 
37 
17 
22 
8 
12 
3 
1 
2 
1 
0 
0 
0 
0 
0 
1 
0 
0 
0 
400 
400 
The measurements, therefore, for both strains are so nearly identical 
that from this standpoint both fall under the same species. A graphic 
representation of the measurements for both strains is given in figure 5. 
Germination of chlamydospores. —In Van Tieghem cells, prepared 
with hanging drops of distilled water, corn meal extract, potato dextrose 
agar, or pure agar, direct germination took place within 24 hours. From 
i^to 12 germ tubes may arise from one spore. 
sexual bodies 
No sexual bodies have been observed in diseased portions of coconut 
or cacao trees or in pure cultures of either of these strains. The absence 
of antheridia places these strains in the Faberi group, in accordance with 
Rosenbaum (<£), 4 4 which embraces the forms in which the antheridia are 
entirely absent or in which the relation of the antheridium to the oogonium 
is unknown.’* 
TAXONOMY 
According to the tentative table offered for the separation of species 
of Phytophthora and devised by Rosenbaum (8), both strains fall into 
the Faberi group and in the species Phytophthora faberi Maubl. The 
discrepancy in the case of the ratio of the length to the width of the 
conidia, alone, does not warrant the creation of a new species for either 
strain, especially in the present state of the Phytophthora group. The 
descriptions and measurements of both strains also correspond to those 
of the original description of the species by Maublanc (4, p. 314-324). 
