[Vor. 11 
92 ANNALS OF THE MISSOURI BOTANICAL GARDEN . 
this substratum from Pg 3.0 to 7.0. This is as wide or nearly 
as wide a range as secured with the majority of the species in the 
Richards' solution. 
The diverse results obtained for the fungi in the solutions at 
different temperatures emphasize the fact that the wood-destroy- 
ing fungi do not react alike to any one set of conditions. For this 
reason it is not feasible to construct a composite curve such as 
Meacham (18) has done, showing а maximum, first, and second 
critical points, and a critical range for different species of fungi. 
Such a curve suggests that all fungi give the same results in any 
given set of environmental factors. It is not believed that this 
is & true assumption. Furthermore, it has been shown that 
different environmental conditions give different results for the 
same fungi. Matsumoto (721), working with strains of Rhizoc- 
tonia, concluded that the hydrogen-ion concentration gave 
diverse results in different nutrient solutions because of the prob- 
able relations to the availability of the food materials in the 
different media. Therefore, since any one species of fungus does 
not necessarily react to a fixed set of environmental factors as 
would a second species, and since the same fungus reacts dif- 
ferently under different conditions, it is impossible to construct 
а composite curve representing growth for several fungi in various 
types of media. 
These species of fungi grow to а small extent in a solution where 
filter-paper strips and a trace of peptone are the sources of carbon. 
The amount of peptone present in every case is only sufficient to 
start, but not to maintain, growth. This ability to utilize cellu- 
lose is lessened in the Richards’ solution when no other source 
of carbon is provided than cellulose derived from different kinds 
of wood. Of all the species, Lenzites sepiaria and Schizophyllum 
commune are least able to utilize the cellulose in a synthetic 
culture. Zeller (716) worked with Lenzites sepiaria and found 
that, on Richards', Colley's “А” and Reed's solutions, and on 
carrot extract with filter-paper and pine-wood celluloses as the 
sources of available carbon, it grew very slowly with slight hydroly- 
sis of the pine-wood cellulose but not of the filter-paper cel- 
lulose. This distinction was not evidenced in the present cultures, | | 
for this species hydrolyzed to a small extent, in a liquid but not 
