129 
Table of measurements of fifty oospores of Peronospora echinospermi Swingle, in actual 
section. * 
Diameter of 
oospore. 
Diameter of 
oospores 
without epis- 
pore. 
Thickness 
of en- 
dospore. 
Thickness 
of 
epispore. 
Diameter 
of 
oogonium. 
35 by 34 
36 by 33 
36 by 34 
36 by 35 
36 by 36 
38 by 33 
38 by 36 
38 by 36 
38 by 37 
39 by 34 
39 by 38 
40 by 34 
*40 by 35 
40 by 36 
40 by 37 
40 by 38 
40 by 39 
40 by 39 
40 by 40 
40 by 40 
40J by 39 
41 by 38 
41 by 40 
41 by 40 
*42 by 34 
42 by 38 
42 by 38* 
42 by 38* 
42 by 38* 
42 by 40 
42 by 40 
*42 by 40 
42 by 42 
43 by 42 
44 by 40 
44 by 40 
*44 by 40 
*44 by 40 
*44 by 41 
*44 by 41 
44 by 42 
44* by 40 
44* by 42 
45 by 45 
46 by 41 
46 by 42 
*46 by 42 
48 by 45 
48 by 47 
50 by 45 
28 by 27 
32 by 28 
28 by 27 
29 by 29 
28 by 28 
29 by 27 
29 by 29 
30 by 30 
30* by 30* 
31 by 27 
30 by 30 
30 by 30 
32 by 28 
32 by 26 
30 by 30 
32 by 32 
29 by 29 
30 by 30 
29 by 29 
31 by 31 
31 by 31 
30 by 30 
30 by 30 
31* by 28 
32“ by 25 
28* by 28* 
29 by 29” 
30 by 28 
31 by 30 
30 by 30 
30 by 30 
31 by 31 
30 by 30 
30 by 30 
32 by 32 
34 by 31 
34 by 31 
36 by 32 
33 by 32 
33 by 32 
32 by 32 
32 by 32 
31* by 31* 
34 by 34 
31 by 31 
31 by 31 
33 by 31 
35 by 35 
34 by 34 
38 by 38 
2 
2 
2* 
2* to 3 
2 
2* 
2a 
2* to 3 
2 
2 * 
24 
2i 
24 
2 
2 
2 
2* 
3 
24 
2 
3 
2 
24 
2 
2 
2 
2 
2 
2 to 2* 
2 
24 
24 
3 
2 to 2* 
2* to 3 
2 
24 
24 
24 
2 
2 to 2* 
3 
2 to 2* 
4 
24 
2 
3 
24 
24 
4 
2* to 2| 
3 to 4 
3 to 4 
2 to 4 
3 to 6 
3 to 4 
2| to 4 
3 to 5 
3 to 4 
2* to 4 
2* to 4 
3 to 4 
4 to 4* 
3 to 4 
4 to 7 
2£t,o 5 
5 to 6 
4 to 5 
4* to 8 
4 to 5 
4 to 6 
4 to 6 
2| to 5 
4 to 6 
4* to 4 
4“ to 6 
2* to 10* 
4" to 8“ 
4 to 6* 
3 to 8 
4 to 6 
4 to 5 
4 to 6 
4* to 5 
4“ to 7 
2| to 4 
4 to 5 
3| to 4 
4 to 4* 
4 to 5 
4 to 6 
5 to 6 
4* to 7* 
4“ to 5“ 
4 to 5 
4* to 7* 
4 to 6" 
4 to 7 
4 to 8 
4 to 6 
40 by 38 
. 54 bj r 40 
46 by 38 
44 by 38 
52 by 44 
54 by 40 
46 by 44 
47 by 22 
50 by 40 
48 by 36 
62 by 46 
46 by 40 
50 by 42 
59 by 41 
46 bv 40 
57 by 42 
50 by 46 
68 by 46 
54 by 50 
48 by 42 
54 by 50 
70 by 40 
54 by 42 
62 by 42 
52 by 38 
44 by 42 
54 by 54 
52 by 44 
52 by 46 
50 by 46 
46 by 44 
50 by 50 
58 by 52 
50 by 48 
54 by 48 
52 by 46 
62 by 60 
56 by 50 
54 by 44 
50 by 46 
50 by 48 
54 by 42 
60 by 52 
64 by 54 
52 by 48 
59 by 52 
60 by 46 
59 by 51 
60 by 52 
64 by 62 
Extremes. 
35 to 50 by 
33 to 47 ‘ 
28 by 28 to 
38'by 38 
j 2 to 4 
2* to 10* £ 
40 to 64 by 
22 to 62 
Most common sizes. 
• 
38 to 45 by 
36 to 42 
. 29 by 29 to 
34 by 34 
| 2 to 3 
2* to 7 \ 
46 to 60 by 
42 to 52 
* All the measurements are from actual sections made through the middle portions of the oospores. 
The specimens were treated with hot water first, and were afterward studied in water alone. In 
measuring, Zeiss’s 2mm. homog. immers. obj., 6 compen. ocular, etc., were used, and with a tube length 
of 159* mm.; one division of the eyepiece equaled 2/x. These measurements were all made from speci¬ 
mens collected by E. Bartholomew. All were from specimens collected on Echinospermum Redowskii 
Lehm., var. occidentale Wats. Collected June 15, 1891, except those marked with an asterisk (*), 
which were on E. Redowskii, var. cupulatum Gr., collected June 10, 1891. All measurements given 
in m’b. 
