566 
ADRIAN J. PIETERS 
Table XIX 
Series V. A My a prolifera. Mycelia Grown Seven Days in Media Shown in Column 2, 
Transferred to Peptone 0.02 Percent + Sucrose M/;^oo. Weight of Mycelia 
Growji Fifteen Days in 200 cc. of Media Shown in Column j. 
Numbers of Oogonia and of Oogonia with Oospores 
Estimated, the Latter in Percentages 
I 
2 
3 
W^eight in 
Milligrams 
Oogonia 
Oogonia 
Oospores 
I 
Pea 
.091 
II 
25% 
10 " 
2 
Peptone 0.1% 
.025 
II 
3 
0.2% 
.0332 
II 
10 " 
4 
0.5% 
•039 
II-III 
20 " 
5 
i-0% 
.0405 
II-III 
75 " 
6 
0.1% + sucrose 
.0270 
II 
10 " 
7 
0.1% + maltose 
.0476 
II 
5 " 
8 
0. 1 % + dextrose 
.036 
o-I 
Few 
9 
0.1% + levulose 
.0286 
0 
10 
0.2% + sucrose 
.0324 
I 
Few 
II 
0.2% -j- maltose 
.058 
II 
10% 
12 
0.2% + dextrose 
.0412 
I 
Few 
13 
0.2% + levulose 
.0346 
O-I 
14 
0.1% + sucrose + salts 
.1140 
II-III 
75% 
15 
0.1% -|- maltose + salts 
.0950 
I 
Few 
16 
0.1% + dextrose + salts 
.1234 
II-III 
90% 
17 
0.1% -j- levulose + salts 
.085 
I 
40" 
18 
0.1% + salts 
.0466 
II 
Few 
20 
.0242 
I 
10% 
see Table XVII. In every case the mycelia grown in solutions con- 
taining potassium, sodium or calcium phosphate, either with or with- 
out sugar, when transferred to peptone-sucrose solutions grew rapidly 
and filled the dish with a mass of fine hyphae on which few or no 
oogonia were formed. Mycelia out of solutions containing nitrates 
or sulphates, on the other hand, made little growth when transferred 
to the peptone-sucrose solution and the number of oogonia was 
recorded as I, II, or III on various myceha. As in the case of S. 
monoica, the addition of phosphates to the solution increased the 
vegetative growth markedly, and the great growth without oogonia 
may be because the peptone-sucrose solution used was not the best 
for the production of oogonia by this kind of mycelium. 
Discussion 
In the preceding pages attention has been called to such con- 
clusions as seemed warranted by the record of each set of experiments. 
