1916] 
ZELLER—PHYSIOLOGY OF LENZITES SAEPIARIA 451 
ing mycelial colonies were taken. Plate 9 shows photographs 
of the comparative growths. The accompanying table (table 
I) shows that on the 5 per cent resin agar the growth was 
reduced somewhat, as compared with the control containing no 
resin; but the growth was just about as rapid on 40, 45, and 
RESULTS OF GROWING LENZITES SAEPIARIA ON PLATES OF RESIN AGAR 
Diameter of growth on resin agar plates 
Per e: after 14 days at 32?C. 
o 
resin Plate Plate Plate Plate 
no. 1 no. 2 no. no. 4 Averages 
cm. cm. cm. cm. cm. 
) (control) 9.0 9.0 9.0 9.0 9.0* 
7.6 7.4 6.8 [9 7.42 
) 6.1 6.2 6.7 7.4 6.6 
6.8 6.5 4,2 5.5 6.5 
20 6.2 6.1 5.9 6.2 6.1 
: 6.4 6.8 6.9 6.4 0.63 
30 6.2 5.7 6.2 5.9 6.0 
1 6.8 7.0 6.6 6.8 6.8 
40 6.5 6.2 6.6 6.4 6.4 
¿ .4 7.0 6.6 6.4 6.85 
50 $.9 6.2 5.7 6.0 5.95 
3.4 3.5 3.8 3.7 3.6 
60 9 1.5 1.8 4 2 
( .8 1.4 1.7 T. .6 
) .8 1.6 1.7 9 .6 
7 .6 1.7 1.8 7 
80 4 1.5 1.1 52 iJ 
8 5 1.6 1.4 1.4 5 
90 0.8 0.8 0.9 1.1 0.9 
9 0.8 0.8 0.8 122 0.9 
100 0.8 0.8 0.8 0.8 0.8 
* The diameter of the inoculum іп each case was 0.8 cm., which should be subtracted from the 
above values in order to obtain the actual growth. 
50 per cent resin as on 5, 10, and 15 per eent, the average 
growth of the former three being 6.4 em., and of the latter 6.84 
em. From 50 to 60 per cent there was an abrupt change in the 
growth, which showed marked inhibition from 60 to 85 per 
cent, while above this there was practically no growth. The 
fact that there was some growth up to 85 per cent resin is con- 
clusive evidence that resin is not toxic. Of course, it could not 
be toxic unless soluble in water or the enzymic fluids excreted 
by the fungus. Its greatest inhibitive power lies in the fact 
that it excludes water from the substrate. The results given 
