196 C. D. Sherbakoff 



On hard lima-bean agar, culture sixteen days old, most of the conidia 

 swollen (only normal, not swollen, conidia, were measured) : 

 Conidia: 1-septate, 9 per cent, 14.7 x 2.5 (12-19.5 x 2.3-3) m 

 2-septate, very rare 



3-septate, 37 per cent, 33 x 3.5 (18-41 x 3-4.1 V 

 4-septate, 14 per cent 



5-septate, 29 per cent, 47 x 3.9 (38-56 x 3.5-4.4) m 

 6-septate, 7 per cent, 50 x 4 (43-58 x 3.9-4.4) m 

 7-septate, 4 per cent, 50 x 4.1 (49-56 x 4-4.3) m 

 8-septate, exceptional, 61 x 4 An (only one found and measured) 



Average of the above measurements: 

 Conidia: 0-septate, 1 per cent 

 1-septate, 6 per cent 

 2-septate, 3 per cent 

 3-septate, 34 per cent, 33.5 x 3.6m 

 4-septate, 10 per cent 

 5-septate, 42 per cent, 45.2x4.1m 

 6- and 7-septate, 4 per cent, 50 x 4.05m 

 8-septate, very rare, 61 x 4.4m (only one measured) 



30. Fusarium sanguineum var. pallidium n. var. (Figs. Ik and 26; 

 PL in, figs. 5 and 6; PI. vn, fig. 7) 



Differs from F. sanguineum by better development of mycelium, by 

 much slower rate of colony growth, by paler color of substratum and 

 conidia (PI. in, figs. 5 and 6), and by chlamydospores which are inter- 

 calary, as in F. sanguineum, but mostly in conidia and not in mycelium, 

 and of much rarer occurrence than in F. sanguineum. 



Hab. On rotted tubers of Solanum tuberosum, in association with 

 F. oxysporum, South Dakota. 



Measurements of conidia on different media are as follows : 



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



from pseudopionnotes : 



Conidia: 2-septate, rare 



3-septate, 53 per cent, 45 x 3.9 (38-56 x 3.5^.1)m 

 4-septate, 20 per cent, 40 x 4 (40-57 x 3.9-4.1)m 

 5-septate, 20 per cent, 53 x 4.1 (47-60 x 3.9^.3)m 

 6- and 7-septate, 7 per cent, 55 x 4.3 (52-61 x 4.1^.8)m 



