WOLPERT—FUNGI AND H-ION CONCENTRATION OF MEDIA 83 
from maple, oak, and poplar woods. Polyporus adustus grows 
best on poplar-wood cellulose, and Pleurotus ostreatus on cellulose 
derived from either maple or poplar woods. Polystictus versi- 
color and Schizophyllum commune, while growing less vigorously 
than either of the other 2 species, do not show decreased growth 
when pine-wood cellulose is used. 
In every case the acidity of the solutions is but slightly changed; 
where the initial is Pg 4.0, the final is 3.5 to 4.1; where the initial 
is Ри 5.0, the final is 4.3 to 4.2; and where the initial is Ру 6.0, 
the final is 5.6 to 6.4. In only one case, Polystictus versicolor in 
maple-wood cellulose, is the final acidity increased where the 
initial is Pa 6.0, while in just one instance, Polyporus adustus 
in poplar-wood cellulose, is the final acidity decreased where the 
initial is Pa 5.0. There is no indication that any fungus tends to 
decrease or increase the active acidity with any degree of regular- 
ity. 
TABLE XIV 
GROWTH АТ 25° C. AND AT DIFFERENT INITIAL Рн IN A MODIFIED 
RICHARDS’ SOLUTION WITH CELLULOSE AS THE 
OURCE OF CARBON 
Fungi 
Schizo- is 
толыға Polystictus phyllum Lenzites Pleurotus 
ustus versicolor commune sepiaria treat 
m 
М щ "4 ш а Е д "Ял м : 
3|3 15113 10 3 [85 3 ре 
3] 2 |58| ЕЕЕ ЕНЕ |6 
= Е хо с ime RE s m ju z 
2.9 2.9 0 2.8 0 2.9 0 2.9 0 2.9 0 
4.0 3.9 1 4.1 2 3.9 1 4.1 2 3.8 1 
5.0 4.5 2 4.5 3 4.5 2 4.8 2 4.6 2 
6.0 5.7 2 6.0 2 6.3 2 6.0 1 6.4 | 3 
2.9 2.9 0 2.8 0 | 3.0 0 3.0 0 2. 0 
4.0 3.9 1 3.6 2 4.0 1 4.0 1 33 2 
5.0 5.2 2 4.6 3 4.5 2 4.5 2 4.3 4 
6.0 6.3 3 5.6 2 6.1 2 6.2 1 6.2 4 
2.9 2.8 0 2.9 0 2.9 0 2.9 0 2.9 0 
4.0 3.5 ї | 481 113311 | ФӨТ | 26 | 1 
5.0 4.9 2714613 1*9 1 | 48 1-68. 8 
6.0 6.0 ера оге 9715212 | 62 | 3 
же ае кт го г торо > у Que 
.0 4.0 2 4.0 1 4.0 0 . 
5.0 5.1 4 4.5 3 4.8 0 5.0 4 
6.0 6.2 3 6.0 0 
