FusARiA OF Potatoes 147 



On rye grain, culture sixty-five days old: 

 Conidia: 3-septate, 20 per cent, 41 x 3.2 (36-46 x 2.9-4) ^ 

 4-septate, 17 per cent, 48x3.3 (40-54 x 2.9-4) ^ 

 5-septate, 63 per cent, 52x3.7 (40-60 x 3-4.1 )yu 



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

 Conidia: 1-septate, very few 



3-septate, 11 per cent, 50x3.3 (29-61 x 3-3.7) m 



4-septate, 4 per cent 



5-septate, 85 per cent, 60x3.5 (45-67 x 3.1-4) /x 



Average of the above measurements: 

 Conidia : 0- to 2-septate, 2 per cent, 20 x 2.5/^ 

 3-septate, 23 per cent, 42 x 3.2n 

 4-septate, 20 per cent 

 5-septate, 55 per cent, 54 x 3.6/i 

 6-septate, very rare, 61 x 3.4/x 



14. Fusarium suhulatum Ap. et Wr. (Fig. Iw; Fig. 12, g to j; PL ii, 

 fig. 11; PI. VII, fig. 4) 



Appel, 0., and Wollenweber, H. W., Arb. K. biol. Anst. Land- u. Forstw. 

 8:118-132, PI. II, figs. 65 to 87. 1910. Wollenweber, H. W., Phytopath. 

 3:32, fig. In. 1913. 



Conidia slightly elliptically curved, typically of nearly even diameter 

 for the greater part of their length, very gradually attenuate toward both 

 ends, slightly pedicellate, typically 5-septate, 58 x 3.64 (48-65 x 3.4-3.85) /x, 

 usually in numerous, sometimes converging sporodochia (| to 1 millimeter 

 in diameter), produced near substratum and lower aerial mycelium, 

 from pink-flesh to apricot-buff and from coral red to brick red in color, 

 with darker shades in old moist cultures; chlamydospores absent; aerial 

 mycelium typically present, at first hyaline, then testaceous color and 

 other hues of red; on various agars from vinaceous tawny and madder 

 brown to pomegranate purple and Eugenia red. 



Hab. A cosmopolitan saprophyte, of very wide occurrence on dead 

 substrata, in soil and water, also parasitic on cereals and on tubers of 

 Solarium tuberosum. 



The organism was twice isolated by the writer from rotted potato 

 tubers, and the strains were compared with a culture of the originally 

 described organism obtained through the courtesy of Dr. Wollenweber 



