144 C. D. Sherbakoff 



other. F, metacroum isolated by the writer is in all respects identical 

 with the originally described organism. 



The measurements of the conidia from the original culture when grown 

 on various media are as follows: 



On red raspberry cane plug, culture twenty-three days old: 

 Conidia: 3-septate, 42 per cent, 46 x 3.2 (35-56 x 2.6-4. l)/i 

 4-septate, 28 per cent, 50 x 3.5 (40-62 x 2.9-4.1)ai 

 5-septate, 30 per cent, 50 x 3.8 (45-63 x 3.3-4.3) /x 



On hard lima-bean agar with 2 per cent glucose, culture eleven days 

 old: 



Conidia: 3-septate, 8 per cent 

 4-septate, 7 per cent 



5-septate, 75 per cent, 54 x 4.1 (35-62 x 3.5-5.7)^ 

 6-septate and more, 10 per cent, the largest spore 12-septate, 

 91 X 5.3m 



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

 Conidia: 3-septate, 15 per cent 

 4-septate, 15 per cent 

 5-septate, 70 per cent, 65 x 4.2 (55-73 x 3.8-4.8) /x 



On potato tuber plug, culture ninety-eight days old: 

 Conidia: 1-septate, 5 per cent, 19 x 3 (14-21 x 2.7-3.5) /x 

 2-septate, few 



3-septate, 10 per cent, 36 x 3.8 (28-43 x 3.5-4.2) m 

 4-septate, 30 per cent, 46 x 3.9 (36-51 x 3.5-4.7) m 

 5-septate, 55 per cent, 50 x 4 (42-63 x 3.5-4.4) ^ 



On potato stem plug, culture one hundred and thirteen days old: 

 Conidia: 3-septate, 25 per cent, 36 x 3.7 (33-39 x 3.4-3.9) /x 



4-septate, 20 per cent, about 39 x 4^ (only a few measured) 

 5-septate, 55 per cent, 43x4 (38-47 x 3.5-4.2) /x, the longest 

 5-septate, 63 x 3.85ju 



On whole steamed potato tuber, culture thirty-eight days old: 

 Conidia: 3-septate, 40 per cent, 42 x 3.9 (37-53 x 3.5-4.1)m 

 4-septate, 35 per cent, 45 x 4.1^ 

 5-septate, 25 per cent, 54 x 4.3 (47-63 x 3.7-4.8) /x 



