1924 
WOLPERT—FUNGI AND H-ION CONCENTRATION OF MEDIA 75 
the optimum temperature in the one solution is not necessarily 
the optimum in the other, for in the Richards' solution the fungus 
shows poorest. growth at 15? C., while in the peptone solution it 
shows best growth at this same temperature. Тһе poorest results 
are given at 35? C. in the peptone solution and intermediate in 
the Richards' solution. Тһе optimal Pg range in the peptone is 
- Eae Ны улл 15° 
ee 
-75 . % 2 
== а dem қ» 
no : . 
Ж E 4 А 
с A: X 
- : . 
Ф , * 
-50 е I eo ` 
Е , ” а d ipe К 
M = —_ “ z 
"20 f қ 
// < Д 
FA 5 
E ? M 
/ : қ T 
>. көзе T Т Т Т T T 
Н + 5 B 7 
Fig.15. Schizophyllum commune in Richards' solution. 
Somewhat more acid than that in the Richards' solution, in the 
first case being close to the zone Pg 3.5-5.0 and in the second, 
to the zone 4.0-6.5. Except at the 2 lower temperatures in the 
peptone solution, there is no indication of a marked optimum Pg. 
Although the Ру range at 15? C. is somewhat narrower than at 
the other 2 temperatures, Schizophyllum commune (table x1) 
grows best at this temperature in the Richards' solution (fig. 15). 
Неге the Р, limits are 3.7 and 7.0, while at 25° C. and 35° C. 
