224 CD. Sherbakoff 



42. Fusarium oxysporum Schlecht. var. longius n. var. (Figs. lMi and 36) 

 Differs from F. oxysporum and other varieties of the species by longer 

 macroconidia, typically 3-septate, 38.94 x 4.04 (34-45 x 3.6^.4) /*, often 

 4- and 5-septate; no sclerotia; no macroscopical sporodochia. 



Hab. In discolored fibrovascular bundles of tubers of Solarium tube- 

 rosum and of wilted stems, in New York, California, Maryland, and 

 Connecticut. 



On slightly acidified hard potato agar, culture twenty-one days old: 



(1) Conidia from pseudopionnotes 



Conidia: 0-septate, 1.5 per cent, 10 x 3 (8-12 x 2.5-3.5) /* 

 1-septate, 3 per cent, 18 x 3.5 (14-21 x 3-4) /z 

 2-septate, 0.5 per cent 



3-septate, 60 per cent, 42.7 x 4.1 (28-54 x 3.6-4.8)/* 

 4-septate, 26 per cent, 49 x 4.3 (42-58 x 4-4.8)/* 

 5-septate, 9 per cent, 51.4 x 4.6 (46-60 x 4.3-4.7)/* 



(2) Chlamydospores, terminal and intercalary 

 Chlamydospores : 0-septate, 7-9 x 5-6/* 



On red raspberry cane plug, culture forty-six days old; conidia from 

 mycelium close to substratum: 

 Conidia: 0-septate, 1.7 per cent, 11 x 2.6/* 



1-septate, 1 per cent, 19 x 3/* 



2-septate, rare 



3-septate, 93 per cent, 34 x 4.4 (19-44 x 3.5-5.7)/* 



4-septate, 4.3 per cent, 40 x 4.6 (35^4 x 4.2-4.8)/* 



On corn meal agar, culture twenty-two days old; conidia from surface 

 of medium: 

 Conidia: 0-septate, 20 per cent 



1-septate, 8 per cent 



2-septate, 2 per cent 



3-septate, 40 per cent, 45 x 3.6 (36-54 x 3.2-4.2)/* 



4-septate, 20 per centl ,, , , „_ . 



_ .. , n . ? the largest 67 x 4/t 



5-septate, 10 per cent J 



