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 witrr9rand 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. 



GROWTH OF H. No. 1 ON CORN-MEAL AGAR 



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. Various 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. 



