132 



C. D. Sherbakoff 



Hab. On rotted tubers of Solatium tuberosum, together with Ramularia 

 Solani, Long Island, New York. 



Differs from F. udum (Berk.) Wr. in that the conidia are shorter and 

 thicker, and somewhat broader toward the apex. 



The following measurements were taken: 



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

 Conidia: 0- and 1-septate, only when young 



3-septate, 100 per cent, 33 x 4.25 (28-39 x 3.5-4.7) fx 



Fig. 5. — Fusarium udum var. Solani. a, Different forms of chlamydospores from 85-days- 

 old culture on hard potato agar with 5 per cent glucose; b, conidia from 9-days-old culture on 

 hard lima-bean agar; c, conidia, d, conidiophores, from ^9-days-old culture on rye straw; E, 

 conidiophores (magnified 250 times) from 8-days-old culture on slightly acidified hard potato 

 agar; f, conidia from 72-days-old culture on potato tuber plug; g, conidia, h, conidiophores, 

 from 8-days-old culture on slightly acidified hard potato agar; i, conidia, J, K, conidiophores, 

 from 7 ^-days-old culture on red raspberry cane plug 



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



(1) From an advanced part of colony growth 

 Conidia: 1-septate, rare 



2-septate, 10 per cent, 22 x 3.8 (19.5-24 x 3.3-4. 1) M 

 3-septate, 90 per cent, 25 x 4 (22-31 x 3.9-4.6)^ 



(2) From an old part of colony growth 



Conidia: 3-septate, 100 per cent, 28 x 4^ dominant type 

 4-septate, rare 



