FUNGI OF IMPORTANCE IX THE DECAY OE TIMBERS. 
13 
Table 3. — Effect of drying at different temperatures upon the germination of 
basidiospores of Trametes serialis and Lentinus lepideus. 
Drying temperature. 
Trametes serialis (spores 2 
years old). 
Period. 
Germination 
(per cent). 
Dried. Check 
Lentinus lepideus (spores 5 
months old). 
Period. 
Germination 
(per cent). 
Dried. Check. 
At 2S° C. (S2° F. 
Beginning. 
1 week 
2 weeks . . . 
-1 weeks . . . 
6 weeks . . . 
Beginning. 
2 weeks . . . 
4 weeks . . . 
6 weeks — 
8 weeks . . . 
9i weeks.. 
At32°C. (89° F.). 
it 36° C. (97° F.). 
[Beginning.. 
1 week 
2 weeks 
4 weeks i 
i) weeks 
!)£ weeks I 
Beginning 
2 weeks.. 
4 weeks . . 
6 weeks.. 
8 weeks . . 
9h weeks. 
50 : 
51 
24 
28 
14 

50 I 
53 
22 
17 
5 I 

Trametes serialis (spores 10 
days old). 
Lentinus lepideus (spores 7 
months old). 
Beginning. 
10 days.... 
IS days.... 
28 days.... 
99 ; Beginning. 
45 10 days.... 
20 I 18 days.... 
20 28 days.... 
C 1 ) 
1 Less than 1 per cent. 
Table 4. — Effect of drying basidiospores of Lenzites sepiaria, Trametes serialis, 
and Fomes roseus at 40° C. 
1 Lenzites sepiaria (spores 
fresh). 
Trametes serialis (spores 
fresh). 
Fomes roseus (spores 5 
months old). 
Drying 
temperature. 
Germination 
(per cent). 
Feriod. 
Period. 
Germination 
(per cent). 
Period. 
Germination 
(per cent). 
. Dried. 
Check. 
Dried. 
Check. 
Dried. 
Check. 
40° C. (104° F.).. 
(Beginning. 38 
J 1 week 13 
1 20 days.... 8 
12 months.. 3 
38 
39 
39 
38 
Beginning. 
1 week 
6 weeks . . . 
76 
14 
7 
75 
75 
70 
Beginning. 38 
1 week 
30 
26 
EFFECT OF ALTERNATE WETTING AXD DRYING UPON 
BASIDIOSPORES. 
THE VIABILITY OF THE 
In removing spores from a spore cast on a glass slide, a large 
number of the spores dislodged from the slide by the water are left 
behind. From the point of view of economy of material the ques- 
tion naturally arose as to whether or not these spores wet once and 
allowed to dry out again were capable of normal germination. A 
number of tests made upon different lots of spores of varying ages 
from fresh ones to those a few weeks old seem to show that alternate 
wetting and drying reduce the percentage of viable spores. In one 
