Oct. 29, 1917 
Fungus Fairy Rings 
211 
The mean temperature of the soil during May and June, 1909, was 57 0 
and 67° F., respectively. During 1915, when the fungi fruited abund¬ 
antly, the soil temperature records were not complete, but indicate 
that conditions were nearly the same as in 1909, the values being 56° 
and 71 °, respectively. The mean air temperatures did not vary markedly 
during the different years, except that 1915 was cooler than the other 
years. This is indicated in the maximum and minimum as well as in 
the mean temperatures. 
WEATHER AND SOIL CONDITIONS DURING THE FRUITING PERIODS 
The conditions during and preceding the principal fruiting periods in 
1909 and 1915 are given in Table IV. The conditions during the period 
of fruiting are of interest in connection with the character of the fruit¬ 
ing bodies and the length of the fruiting period. The conditions immedi¬ 
ately preceding determine whether or not fruiting bodies will be pro¬ 
duced. 
Table IV .—Weather conditions for 10 days preceding and during the fruiting period of 
Agaricus tabularis and Calvatia cyathiformis 
Species and period. 
Daily 
evap¬ 
ora¬ 
tion. 
Daily 
rain¬ 
fall. 
Climatic conditions. 
Soil moisture 
conditions. 
Per¬ 
cent¬ 
age 
of 
days 
with 
rain. 
Temperature (°F.). 
First 
foot. 
Second 
foot. 
Soil. 
Air. 
Mean. 
Mean. 
Maxi¬ 
mum. 
Mini¬ 
mum. 
Agaricus tabularis: 
Inch. 
Inch . 
Fruiting period, June 3-19, 
0. 218 
0. 29 
65 
65 
62 
91 
41 
Moist.. . 
Moist. 
1909. 
Previous 10-day period, 
• 197 
. 08 
60 
57 
55 
85 
36 
.. .do. 
Do. 
Hay 25“June 3, 1909- 
Fruiting period, June 5-24, 
. 208 
• *3 
60 
60 
82 
35 
.,,do. 
Do. 
1915- 
Previous 10-day period, 
. 132 
• 25 
80 
54 
71 
37 
...do. 
Do. 
Hay 26-June 4, 1915. 
Fruiting period, Aug. 16-20, 
• 199 
. 06 
80 
7 i 
63 
82 
49 
.. .do. 
Do. 
1915. 
Previous 10-day period, 
. 204 
. 12 
80 
7 i 
57 
82 
35 
...do. 
Do. 
Aug. 6-15, 1915. 
Calvatia cyathiformis: 
Fruiting period, June 12-19, 
• 232 
.04 
SO 
67 
64 
83 
46 
...do. 
Do. 
1909. 
Previous 10-day period, 
. 192 
.28 
80 
63 
60 
91 
41 
...do. 
Do. 
June 2-11, 1909. 
Fruiting period, July 13-17, 
.294 
0 
0 
59 
7 i 
91 
54 
...do. 
Dry. 
1909- 
Previous 10-day period, 
• 293 
.28 
So 
65 
78 
90 
51 
Dry to 
Moist to 
July 3-12, 1909. 
moist. 
dry. 
Fruiting period, June 14-24, 
. 186 
.04 
64 
a 70 
62 
82 
46 
Moist.. . 
Moist. 
^ 9 ^ 5 * , 
Previous 10-day period, 
•234 
. 26 
70 
56 
82 
35 
...do. 
Do. 
June 4-13, 1915. 
Fruiting period, Aug. 16-20, 
. 199 
. 06 
80 
7 i 
63 
82 
49 
...do. 
Do. 
1915* 
Previous 10-day period. 
. 204 
. 12 
80 
7 i 
57 
82 
35 
.. .do. 
Do. 
Aug. 6-15, 1915. 
o Record incomplete. 
