FusARiA OF Potatoes 149 



On rye grain, culture sixty-five days old: 

 Conidia: 3-septate, 4 per cent, 52 x 3.4 (42-55 x 2.9-4) ^t 



4-septate, 15 per cent, 54 x 3.5 (42-67 x 2.9-4.1)/i 

 5-septate, 81 per cent, 64 x 3.7 (45-75 x 2.9-4.2)/i 



On hard lima-bean agar, culture ten days old: 

 Conidia: 0-septate, rare 



2-septate, very rare 



3-septate, 11 per cent, 45 x 3.1 (33-60 x 3-3.5)At 



4-septate, 19 per cent 



5-septate, 70 per cent, 60 x 3.6 (53-67 X 3.1-4) M 



9-septate, rare, 69 x 5.7 ij, (only one measured) 



Average of the above measurements: 

 Conidia: 0-septate, none to rare 



1- and 2-septate, none to rare 

 3-septate, 11 per cent, 43.3 x 3.3ju 

 4-septate, 15 per cent 

 5-septate, 74 per cent, 58 x 3.64/i 

 6- to 9-septate, none to rare 



The averages of Appel and Wollenweber's measurements for the same 



organism are as follows: 



Conidia: 1-septate, rare 



3-septate ) _„ ^ J 36.5 x 3.86u 



, , > 28 per cent S r. ^ o t^ 

 4-septate J l^ 51.5x3.5ju 



5-septate, 62 per cent, 61 x 3.86/i 



6-septate, 9 per cent, 69 x 4jli 



7-septate, 1 per cent 



This shows the 5-septate conidia to be in about the same proportion 



and of about the same size as found by the writer, 



15. Fusarium subulatum Ap. et Wr. var. brevius n. var. (Fig. 12, 

 a to f; pi. II, fig. 12; PL vii, fig. 3) 



Conidia and fruiting forms of the same type as those of F. subulatum; 

 chlamydospores also absent; 5-septate conidia average 50x3.8 (41-58 x 

 3. 1-4.2) /i in size. 



Hab. On rotted tuber of Solanum tuberosum, Ithaca, New York. 



