FusARiA OF Potatoes 189 



On potato tuber plug, culture twenty-four days old; conidia from small 

 sporodochia : 

 Conidia: 1-septate, 1 per cent, about 14 x 3.5/^ (only one measured) 



3-septate, 10 per cent, 35 x 3.6 (27-43 x 3-4.4) ^ 



4-septate, 12 per cent 



5-septate, 77 per cent, 45 x 4 (35-51 x 3.3-4.8) /z 



6- and 7-septate, rare, 52 x 4.5^1 (only two measured) 



On potato stem plug, culture one hundred and seven days old; conidia 

 from aerial mycelium: 

 Conidia: 0-septate, rare 



1-septate, 2 per cent 



2-septate, rare 



3-septate, 50 per cent, 31 x 3.7^ 



4-septate, 25 per cent, 40 x 4/x 



5-septate, 23 per cent, 42 x 4.2 (35-48 x 3.9-4.7) m 



On whole steamed potato tubers, culture forty-nine days old: 



(1) Conidia from numerous small sporodochia, close to the substratum 

 Conidia: 3-septate, 6 per cent, about 30 x 3.5 (only a few spores measured) 



4-septate, 6 per cent 



5-septate, 80 per cent, 46 x 4.1 (40-53 x 3.9-4.1)ai 

 6-septate, 5 per cent, 54x4.1 (42-65 x 4-4.7) m 

 7-septate, 3 per cent, 59 x 4.2 (48-65 x 4. 1-4.5) /i 

 10-septate, only one was observed, 58 x 4.3^1 (the largest) 



(2) Conidia from small sporodochia, in aerial mycelium 

 Conidia: 3-septate, rare • • 



4-septate, rare 



5-septate, nearly 100 per cent, 51 x 4 (45-55 x 3.6-4.3)jii 



6-septate, rare 



On medium soft agar, culture eleven days old; conidia from aerial 

 mycehum close to substratum: 

 Conidia: 1-septate, 2 per cent, 24 x 3.2 (only a few measured) 



3-septate, 8 per cent, 42 x 4/i (only a few measured) 



4-septate, 10 per cent 



5-septate, 77 per cent, 45 x 4.1 (41-62 x 3.1-4.8)m 



6-septate, 3 per cent, 49 x 4.3^ (only a few measured) 



