98 
is obvious that such drying as is here recorded results in increase in the 
number of conidia per conidiophore; in great reduction in the modal mean 
and length; in increase in variability; and even in bimodality of length- 
graph. A count of scars per conidiophore gives the following: 1 case with 
4 scars; 1 with 5; 3 cases with 6 scars; 3 with 7; 2 with 8; 2 with 9; and 1 case 
with 10. This record affords a marked contrast with the more usual con- 
dition of only 1, 2, or 3 conidia per conidiophore. 
TEMPERATURE RELATIONS 
The following is the record of H. No. 1 on 10°, 15°, 25°, and 30° 
washed agar at 87 hours: at 10°, trace of growth; at 15°, colony 10 mm. in 
diameter; at 25°, 21 mm. in diameter, at 30°, 19 mm. 
GrowtTH oF H. No. 1 ON CoRN-MEAL AGAR 
Temper-| Dish Growth of colony-diameter (millimeters) at time-periods indicated 
ature | No. 
2 da. | 3 da. | 4 da. | 5 da. | 6 da. | 7 da. | 9 da. | 13da. | 17 da. | 20 da. 
10° 1 4 11 Sg ll |" weer 18 22 29 40 49 55 
2 7 PASS ONE See Pe (arte 16 20 27 39 48 56 
Average|...... SEO LL alle creed sje ate okie 17 21 28 3955 |"48.5 |) 555 
15° 1 8 18 28 39 50 61 6 
2 10 21 31 39 48 55 67 
Average|...... 9 19.55) 29)5 49 58 71.5 
1 16 28 41 53 63 73 92 
mn 
w 
oO 
ah 2 1S) 27 39 Sil 60 69 87 
Average|...... 14.5 | 27.5 | 40 52 Oiler || (Al 89.5 
25° 1 17 34 48 61 75 | 90 
2 19 34 48 60 74 90 
Average|...... 18 34 48 60.5 | 74.5 | 90 | 
30° 1 18 32 45 57 71 84 
2 20 34 46 57 12) 85 
Average|...... 19 33 ASO ot HAS) ||| 84.5) | 
Steady increase in growth-rate is apparent up to 25° with a slight 
decrease at 30°. Bakke (6) places the optimum for H. teres as 23°— 
25°. Warious changes in the appearance of the colony resulted from cer- 
tain temperatures. Thus at 10° there was no zonation, no aerial mycelium, 
and very few conidia. At 15°, zonation was very faint, barely perceptible; 
at 20° and 25° more marked; while at 30° the aerial mycelium was very 
' scant and zonation lessened. 
