Feb. 12, 1917 
Studies of the Genus Phytophthora 
257 
TablB III .—Summary of measurements of chlamydospores and oospores of species of 
Phytophthora 
Class. 
Chlamydospores. 
Oospores. 
P. fa¬ 
beri 
P Ja¬ 
trophae 
P. nico¬ 
tianae 
P. pa¬ 
rasitica 
P. cac- 
torum 
(Phyl- 
locac- 
tus sp.) 
P. cac- 
torum 
(Panax 
sp.) 
P. 
fagi 
P. syr- 
ingae 
P.pha- 
seoli 
P. are- 
cae 
P. ery- 
throsep- 
tica 
M 
17.5 to 19.49... 
0 
0 
3 
0 
1 
2 
0 
0 
6 
0 
0 
19.5 to 21.49... 
0 
0 
18 
0 
5 
3 
2 
0 
16 
0 
0 
21.s to 23.49... 
0 
8 
59 
5 
32 
22 
13 
13 
69 
8 
1 
23.5 to 25.49... 
0 
16 
45 
17 
58 
41 
14 
23 
92 
9 
3 
25.5 to 27.49... 
0 
47 
8x 
46 
178 
160 
67 
75 
140 
37 
4 
27.5 to 29.49... 
4 
45 
40 
58 
68 
95 
72 
87 
47 
45 
9 
29.S to 31.49. •* 
23 
7 i 
45 
121 
48 
58 
xo6 
107 
26 
84 
37 
3I-S to 33 - 49 ... 
25 
4 i 
28 
59 
7 
12 
5 i 
53 
3 
67 
44 
33.5 to 35.49... 
Si 
45 
33 
43 
3 
7 
46 
30 
1 
59 
96 
35.5 to 37.49.. ■ 
52 
37 
5 
20 
0 
0 
13 
6 
0 
37 
61 
37.5 to 39.49... 
80 
37 
20 
19 
0 
0 
12 
4 
0 
31 
93 
39.5 to 41.49... 
45 
25 
4 
6 
0 
0 
2 
1 
0 
8 
29 
41.5 to 43.49... 
63 
18 
8 
3 
0 
0 
1 
1 
0 
6 
13 
43.5 to 45.49.. ■ 
19 
6 
3 
2 
0 
0 
0 
0 
0 
6 
8 
45.5 to 47.49... 
20 
4 
4 
1 
0 
0 
0 
0 
0 
2 
2 
47.5 to 49.49.. ■ 
11 
0 
3 
0 
0 
0 
0 
0 
0 
1 
0 
49*5 to 51.49... 
51.5 to 53 . 49 ... 
7 
0 
53.5 10 55.49... 
55.5 to 57 - 49 ... 
57.5 to 59 - 49 ... 
1 
0 
0 
0 
Total... 
400 
400 
400 
400 
400 
400 
400 
400 
400 
400 
400 
The curves shown in figures xo to 12 were constructed from the data 
given in Table III, except that the classes were made to differ by 4 
Fig. 10.—Graph showing the variation in the diameters of chlamydospores of 
Phytophthora nicotianae, P. parasitica , P, faberi, and P. jatrophae. 
instead of 2 p.. Figure 10 shows the variation in the diameter of the 
chlamydospores in each of the species, as well as the differences in the 
