FusARiA OF Potatoes 



235 



vel ferme nullo, quae cum ita sint substrate pseudopionnotibus obsito; 

 chlamydosporis paucis, non catenulatis; aerio mycelio substratoque ex albo 

 pallide rubello vel eodem colore quod in Tab. iii, figg; 11, 12, exhibente; 

 pseudopionnotibus e pallide rubello ''olive-buff" (R) et "chocolate brown" 

 (R); sporodochiis nitide "orange" (R). 



Hab. In tuberibus putridis Solani tuberosi una cum F. coeruleo, Cas- 

 tile, New York, Amer. bor. 



Measurements of conidia on various media are as follows: 



On red raspberry cane plug, culture ninety-two days old; conidia from 

 pseudopionnotes : 

 Conidia: 3-septate, 5 per cent, 27 x 4.2 (20-35 x 4-4.7) ^ 



5-septate, 95 per cent, 35 x 4.8 (29-39 x 4.3-5.7) /x 



Fig. 40. — Fusariuyn clavatum. a, Conidia from a thin layer near substratum from 92- 

 days-old culture on red raspberry cane plug {cojiidia 1 and 5 are typical, but in certain areas 

 conidia like 2, 3, and 4 were present almost to the exclusion of the other kinds); b, conidia from 

 thin layer from 120-days-old culture on potato stem plug; c, pseudopionnotal conidia from 41- 

 days-old culture on rye straw; d, pseudopionnotal conidia from 32-day s-old culture on hard 

 oat agar; e, pseudopionnotal conidia from 10-days-old culture on potato agar; f, pseudopionnotal 

 conidia from 9-day s-old culture on hard lima-bean agar; g, chlamydospores from 10-days-old 

 culture on potato agar 



On hard lima-bean agar with 2 per cent glucose, culture twenty-two 



days old; conidia from aerial mycehum: 



Conidia: 3-septate, 60 per cent, 26 x 4.9 (19-38 x '4.3-5.3) m 



4-septate, 16 per cent, 32 x 5.2iJ. (only one measured) 

 5-septate, 24 per cent, 32 x 5.15 (29-36 x 4.7-5.3)m 



On medium soft potato agar, culture ten days old; conidia from aerial 

 mycelium (chlamydospores intercalary, in chains and clusters) : 

 Conidia: 1-septate, 1 per cent, 16 x 4.4^1 (only three measured) 

 3-septate, 82 per cent, 26x5 (23-31 x 4.7-5.4) /x 

 4-septate, 9 per cent, 29 x 5.1 (28-32 x 4.7-5.3) /x 

 5-septate, 8 per cent, 32 x 5.2 (29-34 x 4.7-5.3) ^ 



