FusARiA OF Potatoes 133 



On potato tuber plug, culture seventy-two days old : 

 Conidia: Q-septate, rare, young 



1-septate, 5 per cent, mostly young 



2-septate, 2 per cent, mostly young 



3-septate, 86 per cent, 31 x 4.4 (23-40 x 3.9-4.7)^ 



4-septate, 7 per cent, 32 x 4.4 (28-40 x 4. 1-4.7) m 



5-septate, rare, 35 x 4.4 (30-40 x 4-4.6) ^ 



On hard lima-bean agar, culture four days old : 

 Conidia: 1-septate, 1 per cent, young 

 2-septate, 4 per cent, 31 x 4.4 

 3-septate, 95 per cent, 34 x 4.5 (25-40 x 4. 1-4.9) )u 

 4-septate, rare, 40 x 5.1 (only a few measured) 



Average of the above measurements: 

 Conidia: 0-septate, rare to none 



1-septate, 1.5 per cent, (usually immature) 

 2-septate, 4 per cent 

 3-septate, 93 per cent, 30.2 x 4.27^ 

 4-septate, 1.5 per cent, 36 x 4.75^ 

 5-septate, rare to none 



IV. Section Gibbosum \yr., Phytopath. 3:31, fig. 1, l and m 



Conidia with from hyperbolic or parabolic to elhptic dorsal curve, 

 conspicuously broader in the middle, with more or less long, narrow apex, 

 prominently pedicellate, mostly 5-septate; intercalary chlamydospores 

 always present; color of substratum and conidial mass typically from 

 pale buff to cinnamon and sepia; mycelium from hyaline to brown. 



7. Fusarium gibbosum Ap. et Wr. (Figs. 1y and 6) 



Appel, O., and Wollenweber, H. W., Arb. K. biol. Anst. Land- u. Forstw. 

 8 : 185-190, text fig. 10, c and d. 1910. Wollenweber, H. W., Phytopath. 

 3:32, fig. 1,M. 1913. 



Conidia often with hyperbolic dorsal curve, conspicuously broader in 

 the middle, with long, narrow apex, prominently pedicellate, typically 

 5-septate, 41.6x4.6 (40-46 x 4.4-4.7) )u, sometimes also 0- to 7-septate, in 

 minute nonconverging sporodochia or spreading over mycelium singly, 

 from hyaline to light pinkish cinnamon in color; chlamydospores inter- 



