FusAKiA OF Potatoes 157 



On soft potato agar, plate culture fourteen days old ; conidia from thick 

 pseudopionnotal mass near the inoculation point: 

 Conidia: 3-septate, 20 per cent, 42 x 3.4 (35-51 x 3-3.9) ^t 



4-septate, 13 per cent 



5-septate, 67 per cent, 50 x 3.6 (43-65 x 3.1-3.9)// 



On same medium as above, plate culture also; conidia from a small 



sporodochium on aerial mj^celium: 



Conidia: 0-septate, rare 



1-septate, 3 per cent, 16 x 3.1^t (only one measured) 

 2-septate, 2 per cent, 21 x 3.5^ (onlj'- one measured) 

 3-septate, 29 per cent, 33 x 3.8 (22-41 x 3.3-4.2)^ 

 4-septate, 19 per cent 

 5-septate, 47 per cent, 45 x 4.2 (36-64 x 4-4.4) /x 



Average of the above measurements: 

 Conidia: 0-septate, about 1 per cent 

 1-septate, about 9 per cent 

 2-septate, about 1 per cent 

 3-septate, about 31 per cent, 34.8 x 3.7in 

 4-septate, about 18 per cent 

 5-septate, about 40 per cent, 45 x 3.9^ 

 6-septate, very exceptional, 45 x 4.5/i (only two measured) 



Conidia of F. truncatum often have a peculiar flat base, and this species 

 can be separated from all the other Fusaria of potatoes by its typically 

 (though not always) pomegranate purple to carmine conidial masses. 



18. Fusarium lucidum n. sp. (Figs. Iv and 15; PI. ii, figs. 9 and 10; 

 PI. IV, fig. 12;P1. VI, fig. 12) 



Conidia typically ellipsoid, very gradually attenuate toward both ends, 

 distinctly but not prominently pedicellate, 5-septate, 54 x 4.05 (43-63 

 X 3.7-4.7) /i, salmon, often of very bright hues, but paler or denser in from 

 small to large (up to I centimeter in diameter) sporodochia; no chlamy- 

 dospores; conidiophores typically more or less compound, bushlike; mj^- 

 celium from white to pale cinnamon and pomegranate near substratum; 

 when first isolated the fungus has a substratum, on potato agar without 

 glucose from pale pink to tints of pomegranate, and on the same medium 

 with glucose from clay to buckthorn brown. 



