(Vor. 11 
82 ANNALS OF THE MISSOURI BOTANICAL GARDEN 
TABLE XIII 
GROWTH AT 25? C. AND UTILIZATION OF FILTER-PAPER AS THE SOURCE 
OF CARBON IN A WEAK PEPTONE SOLUTION WITH 
DIFFERENT INITIAL Рн 
Fungi 
Polystictus Polyporus Schizophyllum Lenzites 
versicolor adustus commune sepiaria 
м =] & z а 
5. BI | о ш ile 9| n |= 9 hi "а Ж 
312144,318 |f| E| |2я|. Ж | w jaj 
5| 8 |S) ЕЗ 3 РЕН S БЕ АЛ 8 [Sel & 
A |E ХЕЕЕ |x&|$3|&m |55065] & (38) £S 
3.0|3.2]| 3 8 15.0] 3 1 |8. 4| 0 0 3.6 2 1 
40|4.6| 4 5.5.9] 3 1 15715 2 6.2 3 2 
5.0|4.5| 5 5 |58| 4 3 |6.0! 5 2 6.2 3 2 
6.0|]4.7]| 4 4 [5.9] 3 9- T00] 3 1 6.7 3 2 
7016212 1 8 |58 4€ [4 1641-9 11 | 78 tena 
Daedalea Pleurotus Pholiota Armillaria 
confragosa ostreatus adiposa mellea 
3.0128 0 0 | 2.8] 0 0.76419 1 3.8 4 4 
4.0/6.1] 4 8 |6.0| 5 8 |5.5| 4 2 4,5 5 5 
5.0|5.9]| 4 3 |61) 5 8 |5.01| 5 8 5.0 5 5 
6.0/5.2] 5 4 |6.6| 5 8 |6.6| 4 2 4.6 5 5 
7.0| 6.3! 3 217% 8-17-81 2 1 4.3 4 5 
active acidity of the solutions with an initial P, 6.0 and 7.0. 
Pholiota adiposa, Lenzites sepiaria, and Pleurotus ostreatus, on the 
other hand, tend to change the initial Ру 6.0 toward neutrality 
and the initial Ру 7.0 to slight alkalinity. Тһе direction and 
amount of ehange in the active acidity vary with the fungus 
under consideration and with the initial Ру of the solution. 
Polyporus adustus, Polystictus versicolor, Schizophyllum com- 
mune, Lenzites sepiaria, and Pleurotus ostreatus grow slowly in 
the Richards’ solution where cellulose from different species of 
wood is used as the source of carbon (table xiv). Without an 
exception the bulk of the growth is beneath the surface of the 
solution in elose contact with the cellulose, forming an inseparable 
mass. In no case is growth obtained at Ру 2.9, while in the major- 
ity of instances maximum growth occurs at Рн 5.0 and 6.0. Of 
the 5 species, Lenzites sepiaria makes the poorest growth through- 
out and fails to grow at all upon cellulose from poplar wood. 
Pleurotus ostreatus and Polyporus adustus, on the other hand, 
show most active growth. In both of these cases growth is less 
vigorous on pine-wood cellulose than on the other celluloses 
