240 C. D. Shekbakoff 



On red raspberry cane plug, culture seventy-three days old; conidia from 

 a sporodochium : 



Conidia: 0-septate, very rare 



1-septate, 2 per cent, 15 x 3.7 (10-20 x 3-4.2) n 

 2-septate, 8 per cent, 20 x 4.1 (17-23 x 3.6-4.7V 

 3-septate, 88 per cent, 24 x 4.6 (17-29 x 3.9-5.3)ju 

 4-septate, 2 per cent, 28 x 5.2 (25-30 x 4.8-5.7) fx 



On hard lima-bean agar, culture nine days old; conidia from a young 

 plectenchymic sporodochium: 

 Conidia: 1-septate, 2 per cent 



2-septate, 3 per cent, 20 x 4.5 (13-25 x 4.1-4.7)m 



3-septate, 88 per cent, 26 x 4.9 (18-33 x 4.2-6) m 



4-septate, 6 per cent 



5-septate, 1 per cent, 30 x 5.8^ (only a few measured) 



Average of the above measurements: 

 Conidia: 0-septate, very rare 



1-septate, 2 per cent, 15.5 x 3.8ju 

 2-septate, 6 per cent, 19.5 x 4.3jii 

 3-septate, 89 per cent, 24.2 x 4.7/* 

 4-septate, 3 per cent, 29.5 x 5.25m 

 5-septate, few, 30.5 x 5.55m 



The organism seems to be so different from F. discolor that one may 

 wonder why it is considered as a variety rather than an independent 

 species, especially in view of the fact that there are some organisms 

 designated as species which apparently differ very slightly from the 

 other related species. The explanation lies mainly in the fact that, 

 notwithstanding a seemingly great difference, this difference is in unstable 

 characters — greater proportion of one type of septation instead of 

 another, denser color, larger sporodochia, and so forth — and, moreover, 

 in certain instances the two organisms approach each other so closely 

 as to be distinguished only with considerable difficulty if at all. 



51. Fusarium culmorum (W. Smith) Sacc. (PI. iv, fig. 9; PI. v, fig. 8) 

 Cf. Wollenweber, H. W., Journ. Agr. Research 2:260-261, PI. xvi, 

 fig. J. 1914. 



