FusARiA OF Potatoes 247 



On hard lima-bean agar, culture sixty-eight days old; conidia from a 



small sporodochium: 



Conidia: 0- to 2-septate, very rare 



3-septate, 48 per cent, 42 x 5.2 (30-51 x 4.8-5.9) /x 

 4-septate, 50 per cent, 48 x 5.3 (41-53 x 4.8-5.9) /i 

 5-septate, 2 per cent, 51 x 5.5 (43-56 x 5-5.9)/i 



On same medium and of same age as above, conidia from a medium 

 large (about 2 millimeters in diameter), short, column-like sporodochium: 

 Conidia: 0- to 2-septate, very rare 



3-septate, 49 per cent, 45 x 5.2 (36-49 x 4.5-5.6) m 

 4-septate, 51 per cent, 50 x 5.2 (38-56 x 4.8-5.6) ju 

 5-septate, very rare 



Average of the above measurements: 

 Conidia: 0-septate, rare, llx4/x 



1-septate, 1 per cent, 20 x 4.5/i 

 2-septate, very rare 

 3-septate, 53 per cent, 43.9 x 5.15^* 

 4-septate, 43 per cent, 49.3 x 5.3^1 

 5-septate, 3 per cent, 54.3 x 5.57^ 



The average sizes given by Appel and WoUenweber for the same fungus 

 are: 

 Conidia: 3-septate, about 44 per cent, 49 x 5.25ai 



4-septate, about 51.5 per cent, 55 x 5.5^ 



5-septate, about 4.5 per cent, 56.5 x 5.5/i 



54. Fusarium Martii Ap. et Wr. var. viride n. var. (Fig. 44, a to i; PI. 

 VI, fig. 5) 



Differs from F. Martii by having macroconidia somewhat narrower, 

 and usually by a paler color of conidia and substratum; dark blue color 

 of conidial masses not observed. Typical color of conidia in mass, on 

 potato agar rich in glucose, pale smoke-gray, and of substratum pale drab- 

 gray. 



Hab. In discolored fibrovascular bundles of Solanum tuberosum, in 

 stems and tubers, at Atlanta and Castile, New York. 



Measurements of conidia on various media are as follows: 



