198 C. D. Sherbakoff 



4-septate, 15 per cent, 26 x 4.7 (24-30 x 4.6-5.2) /x 



5-septate, 4 per cent, 28x4.7 (26-32 x 4.2-5.2) p, the largest 

 45.5 x 5.2/* 



(2) From pionnotes over the cut surface of the tuber; spore type close 



to that of F. arcuosporum 



Conidia: 3-septate, 68 per cent, 41 x 3.2 (29-48 x 2.9-3.5)/* 

 4-septate, 20 per cent, 44 x 3.4 (36-51 x 3.2-4) /* 

 5-septate, 12 per cent, 48 x 3.4 (40-57 x 3-3.7) » 



On hard lima-bean agar, culture fourteen days old; conidia from 

 pseudopionnotes : 

 Conidia: 1-septate, 2 per cent, 21 x 2.8/* (only three measured) 



2-septate, exceptional 



3-septate, 83 per cent, 37 x 3.5 (33-42 [61 exceptional] x 3-3.9)/* 



4-septate, 12 per cent 



5-septate, 3 per cent, 47 x 3.8 (42-60 x 3.5-4) /* 



On the same medium and of the same age as the above, but from a 

 semi-dry minute sporodochium near the upper margin of the slant: 

 Conidia: 1-septate, 1 per cent 



3-septate, 56 per cent, 43 x 3.8 (37^8 x 3.5-4.1)/* 



4-septate, 29 per cent 



5-septate, 14 per cent, 44 x 3.9 (40-49 x 3.5-4.2)/* 



31. Fusarium bullatum n. sp. (Figs. lAi and 27) 



Conidia typically somewhat less arcuate than the other species of the 

 same section, less pointed toward the apex, and broader, usually distinctly 

 pedicellate, mostly 5-septate, 42x4.3 (31-47x4.1-4.9)/*, from pale 

 cream to salmon in color; chlamydospores intercalary in mycelium, 

 mostly in chains and from small to large clusters; aerial mycelium nearly 

 always well developed, of uniform medium height and density, nearly 

 pure white in color; substratum on various agars from colorless to a tint 

 of light buff. 



Hab. On rotted tuber of Solarium tuberosum, together with F. bullatum 

 var. roseum and with F. oxysporum var. resupinatum, in Iowa. 



