Fusaria of Potatoes 165 



(2) Conidia from small sporoclochia converging into a nearly continuous 

 layer 

 Conidia: 3-septate, 45 per cent, 33 x 3.1 (20-41 x 2.5-3.5)/* 



4-septate, 28 per cent, 40 x 3.2/i (only a few measured) 

 5-septate, 27 per cent, 43 x 3.3 (36-50 x 2.9-4.1)/* 



On hard lima-bean agar, culture thirteen days old; conidia from pseu- 

 dopionnotal stage: 

 Conidia: 3-septate, about 12 per cent, 48 x 3/* (only three measured) 



4-septate, about 8 per cent 



5-septate, 80 per cent, 61 x 3.3 (50-70 x 3.1-3.5)/* 



On hard oat agar, culture thirty-seven days old; conidia from aerial 

 mycelium close to substratum: 

 Conidia: 1-septate, 1 per cent 



3-septate, 20 per cent, 31 x 3.3/* 



4-septate, 15 per cent 



5-septate, 60 per cent, 45 x 3.7 (43-49 x 3.3-4)/t 



6-septate, 4 per cent, 61 x 4.2/t (only one measured) 



On same medium as above, culture twenty-four days old; conidia from 

 pseudopionnotes : 

 Conidia: 3-septate, 10 per cent, 28 x 3.3/z 



4-septate, 4 per cent 



5-septate, 50 per cent, 51 x 4/t 



6-septate, 30 per cent, 60.6 x 4.2/z 



7- and 8-septate, 6 per cent, 75 x 43/t 



Average of the above measurements : 

 Conidia: 0-septate, about 0.5 per cent, 10 x 3.25 /t 

 1-septate, about 4 per cent, 12 x 3.0/t 

 2-septate, about 0.5 per cent 

 3-septate, about 35.5 per cent, 36 x 3.2/t 

 4-septate, about 15 per cent 

 5-septate, about 44 per cent, 48.5 x 3.63/t 

 6- to 9-septate, about 0.5 per cent, 60-100 x 4.7-5.2/x 



The most characteristic features of the fungus are as follows: 0- to 

 3-septate, spindle-shaped conidia of aerial mycelium; 3- to 5-septate, 



