[Vor. 11 
54 ANNALS OF THE MISSOURI BOTANICAL GARDEN 
each figure represents а single fungus. In order to keep the size 
of the curves within reasonable limits, the ordinates have been 
given different unit values, in some cases a unit being 25 mgs., in 
some, 50 mgs., and in 2 cases, 100 mgs. 
EXPERIMENTAL DATA 
The experimental data will be presented in accordance with 
the following grouping of the culture media: (1) Richards' solu- 
tion and peptone solution with sugar, (2) peptone solution with- 
out sugar, (3) peptone solution with filter-paper, (4) Richards' 
solution with cellulose, and (5) Richards' solution with cellulose 
and agar. 
The effects of changes in the hydrogen-ion concentration of 
the media and the interrelation between this factor and growth 
-150 ^ 
-oceesmsese sees m, Ф x 
Wt. in Mgs. 
сл — 
о 
RI 
Pu 3 4 
Fig. 2. Lenzitessepiaria in peptone-nutrient solution | 
of Lenzites sepiaria in the peptone solutions and Richards’ solu- | 
tion are brought out in table rv and figs. 1-2. In the Richards || 
solution (fig. 1) the fungus grows slowly. At 15° C. growth is | 
limited by Р, 3.5 and 7.3 with only a trace! at Py 4.0. It is evi- 
1 Where growth is visible to the eye but too little to be weighed accurately it | 
is called а trace. 
