FusARiA OF Potatoes 195 



On red raspberry cane plug, culture twenty-three days old: 



(1) Conidia from pseudopionnotes 



Conidia: 1-septate, 7 per cent, 15 x 2.3 (10-23 x 2.2-2.5)At 

 2-septate, 2.5 per cent 



3-septate, 17 per cent, 32 x 3.4 (22-^3 x 2.8-4.1)// 

 4-septate, 7 per cent, 40 x 3.8 (35-45 x 3-4.3) m 

 5-septate, 63.5 per cent, 47 x 4.2 (38-51 x 3.9-4.3) m 

 6-septate, 3 per cent, 52-60 x 4.1-4.4jli (only a few measured) 

 7-septate, very few, 52-60 x4.1-4.4/i (only a few measured, 

 the thickest, swollen, 6.2/i in diameter) 



(2) Chlamydospores 



(a) Unicellular, in conidia, 6-12.5 x 6-8/i 



(b) Unicellular, in mycelium, 8-17 x 7-14/i 



On slightly acidified hard potato agar, culture nineteen days old; conidia 



from pseudopionnotes: 



Conidia: 1-septate, 1 per cent 



2-septate, 2 per cent 



3-septate, 57 per cent, 37.5 x 3.6 (32-50 x 3-4)/* 



4-septate, 17 per cent, 44 x 3.7 (38-60 x 3.5-4.4)// 



5-septate, 20 per cent, 45 x 4.1 (40-60 x 3.8-4.4)// 



6-septate 1 „ 



„ \, j^ > 3 per cent 



7-septate j 



On potato tuber plug, culture seventy-six days old; conidia from aerial 

 mycelium : 

 Conidia: 0-septate, 5 per cent 



1-septate, 15 per cent 



2-septate, 10 per cent 



3-septate, 55 per cent, 24 x 3.5 (17-35 x 3-4)// 



4-septate, 7 per cent 



5-septate, 8 per cent, 40 x 4.1 (35-43 x 3.5-4.4)// 



On hard lima-bean agar with 2 per cent glucose, culture eight days old; 

 conidia from pseudopionnotes: 

 Conidia: 3-septate, 3 per cent, 41 x 3.8 (35-44 x 3.5-4.1)// 



4-septate, 5 per cent 



5-septate, 90 per cent, 47 x 4.2 (43-51 x 3.9-4.7)// 



6-septate, 2 per cent 



