Fusaria of Potatoes 139 



Hab. On rotted tubers of Solatium tuberosum, New York State. 



Differs from F. falcatum mainly by large sporodochia, more profuse 

 chlamydospore production, well-developed aerial mycelium, and typical 

 absence of pseudopionnotes. 



The organism was isolated only once, from a potato tuber slightly rotted 

 near the stem end, which was received from a potato grower in New York. 

 The measurements of conidia on different media are as follows: 



On slightly acidified hard potato agar, culture four days old: 

 Conidia: 0- and 1-septate, few, very young 



3-septate, 4 per cent, 38 x 4.3 (35-42 x 4.1-4.7)/* 

 4-septate, 6 per cent, 41.6 x 4.4 (35-44 x 4.1^1.7)/* 

 5-septate, 88 per cent, 45.5 x 4.6 (40-49 x 4.1-4.8)/* 

 6- and 7-septate, 2 per cent, 50-80 x 5.5m (only a few measured) 

 The largest 5-septate conidium observed measured 67 x 5.8/* 



On red raspberry cane plug, culture seventy-nine days old: 

 Conidia: 3-septate, 1 per cent 

 4-septate, 4 per cent 

 5-septate, 95 per cent, 40x4.7 (31-48x4.3-5.2)//, 



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

 Conidia: 3-septate, 3 per cent, 34 x 4.4 (19-40 x 3.1-4.7)/* 

 4-septate, 6 per cent 

 5-septate, 91 per cent, 45x4.4 (36-61x4^.8)/* 



On hard oat agar, culture twenty-nine days old, from a sporodochium 

 about 3 millimeters in diameter: 

 Conidia: 3-septate, 2 per cent 



4-septate, 5 per cent 



5-septate, 93 per cent, 51 x 4.6 (45-53 x 4.1-4.9)/* 



Average of the above measurements: 

 Conidia: 3-septate, 2.5 per cent, 36 x 4.3/t 

 4-septate, 5 per cent, 41.6x4.4/* 

 5-septate, 92 per cent, 45 x 4.6/* 

 6- and 7-septate, 0.5 per cent 



