152 



C. D. Sherbakoff 



Hab. In tuberibus aridis Solani tuberosi, Minnesota, Amer. bor. 



The fungus was isolated in association with F. Solani from an old rotted 

 potato tuber from Minnesota. Measurements of conidia from cultures 

 on different media are as follows: 



Fig. 13. — Fusarium effusum. a, Pseudopionnotal conidia from 7 -days-old culture on hard 

 lima-bean agar with 2 per cent glucose; b, pseudopionnotal conidia from 13-days-old culture 

 on hard lima-bean agar {rare forms of conidia shown at the center); c, pseudopionnotal conidia, 

 D, conidiophores, from 9-days-old culture on medium potato agar; e, sporodochial conidia from 

 24-days-old culture on potato tuber plug; f, sporodochial co7iidia frojn 76-days-old culture on 

 red raspberry cane plug; g, typical sporodochial conidia from 107 -days-old culture on potato 

 stem plug; h, character of colony growth {magnification 80 times), i, sporodochial conidia, from 

 S4-days-old culture on rye grain; j, character of spore germination frotn potato-decoction hanging 

 drop in van Tieghem cell {magnification 80 times); k, l, conidiophores, u, normal conidia, 

 N, anastomosed conidia, o, conidiophores, from 36-days-old culture on corn meal 



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



from pseudopionnotes : 



Conidia: 2-septate, rare 



3-septate, 50 per cent, 34 x 4.1 (28-47 x 3-4.7) /x 



4-septate, 10 per cent, 45 x 4.2/i 



5-septate, 40 per cent, 50 x 4.5 (42-65 x 3.5-5.3)/* 



